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<H1>BUSYBOX</H1>
Section: busybox (1)<BR>Updated: 2020-11-11<BR><A HREF="#index">Index</A>
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>
BusyBox - The Swiss Army Knife of Embedded Linux
<A NAME="lbAC">&nbsp;</A>
<H2>SYNTAX</H2>
<PRE>
busybox &lt;applet&gt; [arguments...] # or
&lt;applet&gt; [arguments...] # if symlinked
</PRE>
<A NAME="lbAD">&nbsp;</A>
<H2>DESCRIPTION</H2>
BusyBox combines tiny versions of many common <FONT SIZE="-1">UNIX</FONT> utilities into a single
small executable. It provides minimalist replacements for most of the utilities
you usually find in <FONT SIZE="-1">GNU</FONT> coreutils, util-linux, etc. The utilities in BusyBox
generally have fewer options than their full-featured <FONT SIZE="-1">GNU</FONT> cousins; however, the
options that are included provide the expected functionality and behave very
much like their <FONT SIZE="-1">GNU</FONT> counterparts.
<P>
BusyBox has been written with size-optimization and limited resources in mind.
It is also extremely modular so you can easily include or exclude commands (or
features) at compile time. This makes it easy to customize your embedded
systems. To create a working system, just add /dev, /etc, and a Linux kernel.
BusyBox provides a fairly complete <FONT SIZE="-1">POSIX</FONT> environment for any small or embedded
system.
<P>
BusyBox is extremely configurable. This allows you to include only the
components you need, thereby reducing binary size. Run 'make config' or 'make
menuconfig' to select the functionality that you wish to enable. Then run
'make' to compile BusyBox using your configuration.
<P>
After the compile has finished, you should use 'make install' to install
BusyBox. This will install the 'bin/busybox' binary, in the target directory
specified by <FONT SIZE="-1">CONFIG_PREFIX. CONFIG_PREFIX</FONT> can be set when configuring BusyBox,
or you can specify an alternative location at install time (i.e., with a
command line like 'make CONFIG_PREFIX=/tmp/foo install'). If you enabled
any applet installation scheme (either as symlinks or hardlinks), these will
also be installed in the location pointed to by <FONT SIZE="-1">CONFIG_PREFIX.</FONT>
<A NAME="lbAE">&nbsp;</A>
<H2>USAGE</H2>
BusyBox is a multi-call binary. A multi-call binary is an executable program
that performs the same job as more than one utility program. That means there
is just a single BusyBox binary, but that single binary acts like a large
number of utilities. This allows BusyBox to be smaller since all the built-in
utility programs (we call them applets) can share code for many common
operations.
<P>
You can also invoke BusyBox by issuing a command as an argument on the
command line. For example, entering
<P>
<PRE>
/bin/busybox ls
</PRE>
<P>
will also cause BusyBox to behave as 'ls'.
<P>
Of course, adding '/bin/busybox' into every command would be painful. So most
people will invoke BusyBox using links to the BusyBox binary.
<P>
For example, entering
<P>
<PRE>
ln -s /bin/busybox ls
./ls
</PRE>
<P>
will cause BusyBox to behave as 'ls' (if the 'ls' command has been compiled
into BusyBox). Generally speaking, you should never need to make all these
links yourself, as the BusyBox build system will do this for you when you run
the 'make install' command.
<P>
If you invoke BusyBox with no arguments, it will provide you with a list of the
applets that have been compiled into your BusyBox binary.
<A NAME="lbAF">&nbsp;</A>
<H2>COMMON OPTIONS</H2>
Most BusyBox applets support the <B>--help</B> argument to provide a terse runtime
description of their behavior. If the <FONT SIZE="-1">CONFIG_FEATURE_VERBOSE_USAGE</FONT> option has
been enabled, more detailed usage information will also be available.
<A NAME="lbAG">&nbsp;</A>
<H2>COMMANDS</H2>
Currently available applets include:
<P>
<PRE>
[, [[, acpid, adjtimex, ar, arch, arp, arping, ash, awk, basename,
bc, blkdiscard, blockdev, brctl, bunzip2, busybox, bzcat, bzip2,
cal, cat, chgrp, chmod, chown, chpasswd, chroot, chvt, clear, cmp,
cp, cpio, crond, crontab, cttyhack, cut, date, dc, dd, deallocvt,
depmod, devmem, df, diff, dirname, dmesg, dnsdomainname, dos2unix,
dpkg, dpkg-deb, du, dumpkmap, dumpleases, echo, ed, egrep, env,
expand, expr, factor, fallocate, false, fatattr, fdisk, fgrep, find,
fold, free, freeramdisk, fsfreeze, fstrim, ftpget, ftpput, getopt,
getty, grep, groups, gunzip, gzip, halt, head, hexdump, hostid,
hostname, httpd, hwclock, i2cdetect, i2cdump, i2cget, i2cset, id,
ifconfig, ifdown, ifup, init, insmod, ionice, ip, ipcalc, ipneigh,
kill, killall, klogd, last, less, link, linux32, linux64, linuxrc,
ln, loadfont, loadkmap, logger, login, logname, logread, losetup,
ls, lsmod, lsscsi, lzcat, lzma, lzop, md5sum, mdev, microcom, mkdir,
mkdosfs, mke2fs, mkfifo, mknod, mkpasswd, mkswap, mktemp, modinfo,
modprobe, more, mount, mt, mv, nameif, nc, netstat, nl, nologin,
nproc, nsenter, nslookup, nuke, od, openvt, partprobe, passwd,
paste, patch, pidof, ping, ping6, pivot_root, poweroff, printf, ps,
pwd, rdate, readlink, realpath, reboot, renice, reset, resume, rev,
rm, rmdir, rmmod, route, rpm, rpm2cpio, run-init, run-parts, sed,
seq, setkeycodes, setpriv, setsid, sh, sha1sum, sha256sum,
sha512sum, shred, shuf, sleep, sort, ssl_client, start-stop-daemon,
stat, static-sh, strings, stty, su, sulogin, svc, svok, swapoff,
swapon, switch_root, sync, sysctl, syslogd, tac, tail, tar, taskset,
tc, tee, telnet, telnetd, test, tftp, time, timeout, top, touch, tr,
traceroute, traceroute6, true, truncate, tty, tunctl, ubirename,
udhcpc, udhcpd, uevent, umount, uname, uncompress, unexpand, uniq,
unix2dos, unlink, unlzma, unshare, unxz, unzip, uptime, usleep,
uudecode, uuencode, vconfig, vi, w, watch, watchdog, wc, wget,
which, who, whoami, xargs, xxd, xz, xzcat, yes, zcat
</PRE>
<A NAME="lbAH">&nbsp;</A>
<H2>COMMAND DESCRIPTIONS</H2>
<DL COMPACT>
<DT id="1"><B>acpid</B><DD>
acpid [-df] [-c <FONT SIZE="-1">CONFDIR</FONT>] [-l <FONT SIZE="-1">LOGFILE</FONT>] [-a <FONT SIZE="-1">ACTIONFILE</FONT>] [-M <FONT SIZE="-1">MAPFILE</FONT>] [-e <FONT SIZE="-1">PROC_EVENT_FILE</FONT>] [-p <FONT SIZE="-1">PIDFILE</FONT>]
<P>
Listen to <FONT SIZE="-1">ACPI</FONT> events and spawn specific helpers on event arrival
<P>
<PRE>
-d Log to stderr, not log file (implies -f)
-f Run in foreground
-c DIR Config directory [/etc/acpi]
-e FILE /proc event file [/proc/acpi/event]
-l FILE Log file [/var/log/acpid.log]
-p FILE Pid file [/var/run/acpid.pid]
-a FILE Action file [/etc/acpid.conf]
-M FILE Map file [/etc/acpi.map]
</PRE>
<P>
Accept and ignore compatibility options -g -m -s -S -v
<DT id="2"><B>adjtimex</B><DD>
adjtimex [-q] [-o <FONT SIZE="-1">OFF</FONT>] [-f <FONT SIZE="-1">FREQ</FONT>] [-p <FONT SIZE="-1">TCONST</FONT>] [-t <FONT SIZE="-1">TICK</FONT>]
<P>
Read or set kernel time variables. See <B><A HREF="/cgi-bin/man/man2html?2+adjtimex">adjtimex</A></B>(2)
<P>
<PRE>
-q Quiet
-o OFF Time offset, microseconds
-f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)
-t TICK Microseconds per tick, usually 10000
(positive -t or -f values make clock run faster)
-p TCONST
</PRE>
<DT id="3"><B>ar</B><DD>
ar [-o] [-v] [-p] [-t] [-x] <FONT SIZE="-1">ARCHIVE FILES</FONT>
<P>
Extract or list <FONT SIZE="-1">FILES</FONT> from an ar archive
<P>
<PRE>
-o Preserve original dates
-p Extract to stdout
-t List
-x Extract
-v Verbose
</PRE>
<DT id="4"><B>arch</B><DD>
arch
<P>
Print system architecture
<DT id="5"><B>arp</B><DD>
arp
[-vn]<TT>&nbsp;&nbsp;&nbsp;</TT>[-H <FONT SIZE="-1">HWTYPE</FONT>] [-i <FONT SIZE="-1">IF</FONT>] -a [<FONT SIZE="-1">HOSTNAME</FONT>]<BR>
[-v]<TT>&nbsp;&nbsp;&nbsp;&nbsp;</TT><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT> [-i <FONT SIZE="-1">IF</FONT>] -d <FONT SIZE="-1">HOSTNAME</FONT> [pub]<BR>
[-v]<TT>&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-H <FONT SIZE="-1">HWTYPE</FONT>] [-i <FONT SIZE="-1">IF</FONT>] -s <FONT SIZE="-1">HOSTNAME HWADDR</FONT> [temp]<BR>
[-v]<TT>&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-H <FONT SIZE="-1">HWTYPE</FONT>] [-i <FONT SIZE="-1">IF</FONT>] -s <FONT SIZE="-1">HOSTNAME HWADDR</FONT> [netmask <FONT SIZE="-1">MASK</FONT>] pub<BR>
[-v]<TT>&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-H <FONT SIZE="-1">HWTYPE</FONT>] [-i <FONT SIZE="-1">IF</FONT>] -Ds <FONT SIZE="-1">HOSTNAME IFACE</FONT> [netmask <FONT SIZE="-1">MASK</FONT>] pub<BR>
<P>
Manipulate <FONT SIZE="-1">ARP</FONT> cache
<P>
<PRE>
-a Display (all) hosts
-d Delete ARP entry
-s Set new entry
-v Verbose
-n Don't resolve names
-i IF Network interface
-D Read HWADDR from IFACE
-A,-p AF Protocol family
-H HWTYPE Hardware address type
</PRE>
<DT id="6"><B>arping</B><DD>
arping [-fqbDUA] [-c <FONT SIZE="-1">CNT</FONT>] [-w <FONT SIZE="-1">TIMEOUT</FONT>] [-I <FONT SIZE="-1">IFACE</FONT>] [-s <FONT SIZE="-1">SRC_IP</FONT>] <FONT SIZE="-1">DST_IP</FONT>
<P>
Send <FONT SIZE="-1">ARP</FONT> requests/replies
<P>
<PRE>
-f Quit on first ARP reply
-q Quiet
-b Keep broadcasting, don't go unicast
-D Exit with 1 if DST_IP replies
-U Unsolicited ARP mode, update your neighbors
-A ARP answer mode, update your neighbors
-c N Stop after sending N ARP requests
-w TIMEOUT Seconds to wait for ARP reply
-I IFACE Interface to use (default eth0)
-s SRC_IP Sender IP address
DST_IP Target IP address
</PRE>
<DT id="7"><B>ash</B><DD>
ash [-/+OPTIONS] [-/+o <FONT SIZE="-1">OPT</FONT>]... [-c '<FONT SIZE="-1">SCRIPT</FONT>' [<FONT SIZE="-1">ARG0</FONT> [<FONT SIZE="-1">ARGS</FONT>]] / <FONT SIZE="-1">FILE</FONT> [<FONT SIZE="-1">ARGS</FONT>] / -s [<FONT SIZE="-1">ARGS</FONT>]]
<P>
Unix shell interpreter
<DT id="8"><B>awk</B><DD>
awk [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">AWK_PROGRAM</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
<PRE>
-v VAR=VAL Set variable
-F SEP Use SEP as field separator
-f FILE Read program from FILE
-e AWK_PROGRAM
</PRE>
<DT id="9"><B>basename</B><DD>
basename <FONT SIZE="-1">FILE</FONT> [<FONT SIZE="-1">SUFFIX</FONT>]
<P>
Strip directory path and .SUFFIX from <FONT SIZE="-1">FILE</FONT>
<DT id="10"><B>bc</B><DD>
bc [-sqlw] <FONT SIZE="-1">FILE...</FONT>
<P>
Arbitrary precision calculator
<P>
<PRE>
-q Quiet
-l Load standard math library
-s Be POSIX compatible
-w Warn if extensions are used
</PRE>
<P>
<TT>$BC_LINE_LENGTH</TT> changes output width
<DT id="11"><B>blkdiscard</B><DD>
blkdiscard [-o <FONT SIZE="-1">OFS</FONT>] [-l <FONT SIZE="-1">LEN</FONT>] [-s] <FONT SIZE="-1">DEVICE</FONT>
<P>
Discard sectors on <FONT SIZE="-1">DEVICE</FONT>
<P>
<PRE>
-o OFS Byte offset into device
-l LEN Number of bytes to discard
-s Perform a secure discard
</PRE>
<DT id="12"><B>blockdev</B><DD>
blockdev <FONT SIZE="-1">OPTION BLOCKDEV</FONT>
<P>
<PRE>
--setro Set ro
--setrw Set rw
--getro Get ro
--getss Get sector size
--getbsz Get block size
--setbsz BYTES Set block size
--getsz Get device size in 512-byte sectors
--getsize64 Get device size in bytes
--flushbufs Flush buffers
--rereadpt Reread partition table
</PRE>
<DT id="13"><B>brctl</B><DD>
brctl <FONT SIZE="-1">COMMAND</FONT> [<FONT SIZE="-1">BRIDGE</FONT> [<FONT SIZE="-1">INTERFACE</FONT>]]
<P>
Manage ethernet bridges
<P>
Commands:
<P>
<PRE>
addbr BRIDGE Create BRIDGE
delbr BRIDGE Delete BRIDGE
addif BRIDGE IFACE Add IFACE to BRIDGE
delif BRIDGE IFACE Delete IFACE from BRIDGE
</PRE>
<DT id="14"><B>bunzip2</B><DD>
bunzip2 [-cfk] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress FILEs (or stdin)
<P>
<PRE>
-c Write to stdout
-f Force
-k Keep input files
</PRE>
<DT id="15"><B>bzcat</B><DD>
bzcat [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress to stdout
<DT id="16"><B>bzip2</B><DD>
bzip2 [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Compress FILEs (or stdin) with bzip2 algorithm
<P>
<PRE>
-1..9 Compression level
-d Decompress
-t Test file integrity
-c Write to stdout
-f Force
-k Keep input files
</PRE>
<DT id="17"><B>cal</B><DD>
cal [-jy] [[<FONT SIZE="-1">MONTH</FONT>] <FONT SIZE="-1">YEAR</FONT>]
<P>
Display a calendar
<P>
<PRE>
-j Use julian dates
-y Display the entire year
</PRE>
<DT id="18"><B>cat</B><DD>
cat [-nbvteA] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print FILEs to stdout
<P>
<PRE>
-n Number output lines
-b Number nonempty lines
-v Show nonprinting characters as ^x or M-x
-t ...and tabs as ^I
-e ...and end lines with $
-A Same as -vte
</PRE>
<DT id="19"><B>chgrp</B><DD>
chgrp [-RhLHPcvf]... <FONT SIZE="-1">GROUP FILE...</FONT>
<P>
Change the group membership of each <FONT SIZE="-1">FILE</FONT> to <FONT SIZE="-1">GROUP</FONT>
<P>
<PRE>
-R Recurse
-h Affect symlinks instead of symlink targets
-L Traverse all symlinks to directories
-H Traverse symlinks on command line only
-P Don't traverse symlinks (default)
-c List changed files
-v Verbose
-f Hide errors
</PRE>
<DT id="20"><B>chmod</B><DD>
chmod [-Rcvf] MODE[,MODE]... <FONT SIZE="-1">FILE...</FONT>
<P>
Each <FONT SIZE="-1">MODE</FONT> is one or more of the letters ugoa, one of the
symbols +-= and one or more of the letters rwxst
<P>
<PRE>
-R Recurse
-c List changed files
-v List all files
-f Hide errors
</PRE>
<DT id="21"><B>chown</B><DD>
chown [-RhLHPcvf]... USER[:[<FONT SIZE="-1">GRP</FONT>]] <FONT SIZE="-1">FILE...</FONT>
<P>
Change the owner and/or group of each <FONT SIZE="-1">FILE</FONT> to <FONT SIZE="-1">USER</FONT> and/or <FONT SIZE="-1">GRP</FONT>
<P>
<PRE>
-R Recurse
-h Affect symlinks instead of symlink targets
-L Traverse all symlinks to directories
-H Traverse symlinks on command line only
-P Don't traverse symlinks (default)
-c List changed files
-v List all files
-f Hide errors
</PRE>
<DT id="22"><B>chpasswd</B><DD>
chpasswd [--md5|--encrypted|--crypt-method|--root]
<P>
Read user:password from stdin and update /etc/passwd
<P>
<PRE>
-e,--encrypted Supplied passwords are in encrypted form
-m,--md5 Encrypt using md5, not des
-c,--crypt-method ALG des,md5,sha256/512 (default sha256)
-R,--root DIR Directory to chroot into
</PRE>
<DT id="23"><B>chroot</B><DD>
chroot <FONT SIZE="-1">NEWROOT</FONT> [<FONT SIZE="-1">PROG ARGS</FONT>]
<P>
Run <FONT SIZE="-1">PROG</FONT> with root directory set to <FONT SIZE="-1">NEWROOT</FONT>
<DT id="24"><B>chvt</B><DD>
chvt N
<P>
Change the foreground virtual terminal to /dev/ttyN
<DT id="25"><B>clear</B><DD>
clear
<P>
Clear screen
<DT id="26"><B>cmp</B><DD>
cmp [-l] [-s] <FONT SIZE="-1">FILE1</FONT> [<FONT SIZE="-1">FILE2</FONT> [<FONT SIZE="-1">SKIP1</FONT> [<FONT SIZE="-1">SKIP2</FONT>]]]
<P>
Compare <FONT SIZE="-1">FILE1</FONT> with <FONT SIZE="-1">FILE2</FONT> (or stdin)
<P>
<PRE>
-l Write the byte numbers (decimal) and values (octal)
for all differing bytes
-s Quiet
</PRE>
<DT id="27"><B>cp</B><DD>
cp [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">SOURCE... DEST</FONT>
<P>
Copy <FONT SIZE="-1">SOURCE</FONT>(s) to <FONT SIZE="-1">DEST</FONT>
<P>
<PRE>
-a Same as -dpR
-R,-r Recurse
-d,-P Preserve symlinks (default if -R)
-L Follow all symlinks
-H Follow symlinks on command line
-p Preserve file attributes if possible
-f Overwrite
-i Prompt before overwrite
-l,-s Create (sym)links
-T Treat DEST as a normal file
-u Copy only newer files
</PRE>
<DT id="28"><B>cpio</B><DD>
cpio [-dmvu] [-F <FONT SIZE="-1">FILE</FONT>] [-R USER[:GRP]] [-H newc] [-tio] [<FONT SIZE="-1">EXTR_FILE</FONT>]...
<P>
Extract (-i) or list (-t) files from a cpio archive, or
take file list from stdin and create an archive (-o)
<P>
Main operation mode:
<P>
<PRE>
-t List
-i Extract EXTR_FILEs (or all)
-o Create (requires -H newc)
Options:
-H newc Archive format
-d Make leading directories
-m Preserve mtime
-v Verbose
-u Overwrite
-F FILE Input (-t,-i,-p) or output (-o) file
-R USER[:GRP] Set owner of created files
-L Dereference symlinks
-0 Input is separated by NULs
</PRE>
<DT id="29"><B>crond</B><DD>
crond -fbS -l N -L <FONT SIZE="-1">LOGFILE</FONT> -c <FONT SIZE="-1">DIR</FONT>
<P>
<PRE>
-f Foreground
-b Background (default)
-S Log to syslog (default)
-l N Set log level. Most verbose 0, default 8
-L FILE Log to FILE
-c DIR Cron dir. Default:/var/spool/cron/crontabs
</PRE>
<DT id="30"><B>crontab</B><DD>
crontab [-c <FONT SIZE="-1">DIR</FONT>] [-u <FONT SIZE="-1">USER</FONT>] [-ler]|[<FONT SIZE="-1">FILE</FONT>]
<P>
<PRE>
-c Crontab directory
-u User
-l List crontab
-e Edit crontab
-r Delete crontab
FILE Replace crontab by FILE ('-': stdin)
</PRE>
<DT id="31"><B>cttyhack</B><DD>
cttyhack [<FONT SIZE="-1">PROG ARGS</FONT>]
<P>
Give <FONT SIZE="-1">PROG</FONT> a controlling tty if possible.
Example for /etc/inittab (for busybox init):
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>::respawn:/bin/cttyhack /bin/sh<BR>
Giving controlling tty to shell running with <FONT SIZE="-1">PID 1:</FONT>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>$ exec cttyhack sh<BR>
Starting interactive shell from boot shell script:
<P>
<PRE>
setsid cttyhack sh
</PRE>
<DT id="32"><B>cut</B><DD>
cut [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print selected fields from each input <FONT SIZE="-1">FILE</FONT> to stdout
<P>
<PRE>
-b LIST Output only bytes from LIST
-c LIST Output only characters from LIST
-d CHAR Use CHAR instead of tab as the field delimiter
-s Output only the lines containing delimiter
-f N Print only these fields
-n Ignored
</PRE>
<DT id="33"><B>date</B><DD>
date [<FONT SIZE="-1">OPTIONS</FONT>] [+FMT] [<FONT SIZE="-1">TIME</FONT>]
<P>
Display time (using +FMT), or set time
<P>
<PRE>
[-s,--set] TIME Set time to TIME
-u,--utc Work in UTC (don't convert to local time)
-R,--rfc-2822 Output RFC-2822 compliant date string
-I[SPEC] Output ISO-8601 compliant date string
SPEC='date' (default) for date only,
'hours', 'minutes', or 'seconds' for date and
time to the indicated precision
-r,--reference FILE Display last modification time of FILE
-d,--date TIME Display TIME, not 'now'
-D FMT Use FMT for -d TIME conversion
</PRE>
<P>
Recognized <FONT SIZE="-1">TIME</FONT> formats:
<P>
<PRE>
hh:mm[:ss]
[YYYY.]MM.DD-hh:mm[:ss]
YYYY-MM-DD hh:mm[:ss]
[[[[[YY]YY]MM]DD]hh]mm[.ss]
'date TIME' form accepts MMDDhhmm[[YY]YY][.ss] instead
</PRE>
<DT id="34"><B>dc</B><DD>
dc [-x] [-eSCRIPT]... [-fFILE]... [<FONT SIZE="-1">FILE</FONT>]...
<P>
Tiny <FONT SIZE="-1">RPN</FONT> calculator. Operations:
+, -, *, /, %, ~, ^, |,
p - print top of the stack without popping
f - print entire stack
k - pop the value and set the precision
i - pop the value and set input radix
o - pop the value and set output radix
Examples: dc -e'2 2 + p' -&gt; 4, dc -e'8 8 * 2 2 + / p' -&gt; 16
<DT id="35"><B>dd</B><DD>
dd [if=FILE] [of=FILE] [ibs=N obs=N/bs=N] [count=N] [skip=N] [seek=N]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[conv=notrunc|noerror|sync|fsync]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[iflag=skip_bytes|fullblock] [oflag=seek_bytes]<BR>
<P>
Copy a file with converting and formatting
<P>
<PRE>
if=FILE Read from FILE instead of stdin
of=FILE Write to FILE instead of stdout
bs=N Read and write N bytes at a time
ibs=N Read N bytes at a time
obs=N Write N bytes at a time
count=N Copy only N input blocks
skip=N Skip N input blocks
seek=N Skip N output blocks
conv=notrunc Don't truncate output file
conv=noerror Continue after read errors
conv=sync Pad blocks with zeros
conv=fsync Physically write data out before finishing
conv=swab Swap every pair of bytes
iflag=skip_bytes skip=N is in bytes
iflag=fullblock Read full blocks
oflag=seek_bytes seek=N is in bytes
status=noxfer Suppress rate output
status=none Suppress all output
</PRE>
<P>
N may be suffixed by c (1), w (2), b (512), kB (1000), k (1024), <FONT SIZE="-1">MB, M, GB, G</FONT>
<DT id="36"><B>deallocvt</B><DD>
deallocvt [N]
<P>
Deallocate unused virtual terminal /dev/ttyN
<DT id="37"><B>depmod</B><DD>
depmod [-n] [-b <FONT SIZE="-1">BASE</FONT>] [<FONT SIZE="-1">VERSION</FONT>] [<FONT SIZE="-1">MODFILES</FONT>]...
<P>
Generate modules.dep, alias, and symbols files
<P>
<PRE>
-b BASE Use BASE/lib/modules/VERSION
-n Dry run: print files to stdout
</PRE>
<DT id="38"><B>devmem</B><DD>
devmem <FONT SIZE="-1">ADDRESS</FONT> [<FONT SIZE="-1">WIDTH</FONT> [<FONT SIZE="-1">VALUE</FONT>]]
<P>
Read/write from physical address
<P>
<PRE>
ADDRESS Address to act upon
WIDTH Width (8/16/...)
VALUE Data to be written
</PRE>
<DT id="39"><B>df</B><DD>
df [-PkmhTai] [-B <FONT SIZE="-1">SIZE</FONT>] [<FONT SIZE="-1">FILESYSTEM</FONT>]...
<P>
Print filesystem usage statistics
<P>
<PRE>
-P POSIX output format
-k 1024-byte blocks (default)
-m 1M-byte blocks
-h Human readable (e.g. 1K 243M 2G)
-T Print filesystem type
-a Show all filesystems
-i Inodes
-B SIZE Blocksize
</PRE>
<DT id="40"><B>diff</B><DD>
diff [-abBdiNqrTstw] [-L <FONT SIZE="-1">LABEL</FONT>] [-S <FONT SIZE="-1">FILE</FONT>] [-U <FONT SIZE="-1">LINES</FONT>] <FONT SIZE="-1">FILE1 FILE2</FONT>
<P>
Compare files line by line and output the differences between them.
This implementation supports unified diffs only.
<P>
<PRE>
-a Treat all files as text
-b Ignore changes in the amount of whitespace
-B Ignore changes whose lines are all blank
-d Try hard to find a smaller set of changes
-i Ignore case differences
-L Use LABEL instead of the filename in the unified header
-N Treat absent files as empty
-q Output only whether files differ
-r Recurse
-S Start with FILE when comparing directories
-T Make tabs line up by prefixing a tab when necessary
-s Report when two files are the same
-t Expand tabs to spaces in output
-U Output LINES lines of context
-w Ignore all whitespace
</PRE>
<DT id="41"><B>dirname</B><DD>
dirname <FONT SIZE="-1">FILENAME</FONT>
<P>
Strip non-directory suffix from <FONT SIZE="-1">FILENAME</FONT>
<DT id="42"><B>dmesg</B><DD>
dmesg [-c] [-n <FONT SIZE="-1">LEVEL</FONT>] [-s <FONT SIZE="-1">SIZE</FONT>]
<P>
Print or control the kernel ring buffer
<P>
<PRE>
-c Clear ring buffer after printing
-n LEVEL Set console logging level
-s SIZE Buffer size
-r Print raw message buffer
</PRE>
<DT id="43"><B>dos2unix</B><DD>
dos2unix [-ud] [<FONT SIZE="-1">FILE</FONT>]
<P>
Convert <FONT SIZE="-1">FILE</FONT> in-place from <FONT SIZE="-1">DOS</FONT> to Unix format.
When no file is given, use stdin/stdout.
<P>
<PRE>
-u dos2unix
-d unix2dos
</PRE>
<DT id="44"><B>dpkg</B><DD>
dpkg [-ilCPru] [-F <FONT SIZE="-1">OPT</FONT>] <FONT SIZE="-1">PACKAGE</FONT>
<P>
Install, remove and manage Debian packages
<P>
<PRE>
-i,--install Install the package
-l,--list List of installed packages
--configure Configure an unpackaged package
-P,--purge Purge all files of a package
-r,--remove Remove all but the configuration files for a package
--unpack Unpack a package, but don't configure it
--force-depends Ignore dependency problems
--force-confnew Overwrite existing config files when installing
--force-confold Keep old config files when installing
</PRE>
<DT id="45"><B>dpkg-deb</B><DD>
dpkg-deb [-cefxX] <FONT SIZE="-1">FILE</FONT> [<FONT SIZE="-1">DIR</FONT>]
<P>
Perform actions on Debian packages (.deb)
<P>
<PRE>
-c List files
-f Print control fields
-e Extract control files to DIR (default: ./DEBIAN)
-x Extract files to DIR (no default)
-X Verbose -x
</PRE>
<DT id="46"><B>du</B><DD>
du [-aHLdclsxhmk] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Summarize disk space used for each <FONT SIZE="-1">FILE</FONT> and/or directory
<P>
<PRE>
-a Show file sizes too
-L Follow all symlinks
-H Follow symlinks on command line
-d N Limit output to directories (and files with -a) of depth &lt; N
-c Show grand total
-l Count sizes many times if hard linked
-s Display only a total for each argument
-x Skip directories on different filesystems
-h Sizes in human readable format (e.g., 1K 243M 2G)
-m Sizes in megabytes
-k Sizes in kilobytes (default)
</PRE>
<DT id="47"><B>dumpkmap</B><DD>
dumpkmap &gt; keymap
<P>
Print a binary keyboard translation table to stdout
<DT id="48"><B>dumpleases</B><DD>
dumpleases [-r|-a] [-d] [-f <FONT SIZE="-1">LEASEFILE</FONT>]
<P>
Display <FONT SIZE="-1">DHCP</FONT> leases granted by udhcpd
<P>
<PRE>
-f,--file FILE Lease file
-r,--remaining Show remaining time
-a,--absolute Show expiration time
-d,--decimal Show time in seconds
</PRE>
<DT id="49"><B>echo</B><DD>
echo [-neE] [<FONT SIZE="-1">ARG</FONT>]...
<P>
Print the specified ARGs to stdout
<P>
<PRE>
-n Suppress trailing newline
-e Interpret backslash escapes (i.e., \t=tab)
-E Don't interpret backslash escapes (default)
</PRE>
<DT id="50"><B>ed</B><DD>
ed [<FONT SIZE="-1">FILE</FONT>]
<DT id="51"><B>env</B><DD>
env [-iu] [-] [name=value]... [<FONT SIZE="-1">PROG ARGS</FONT>]
<P>
Print the current environment or run <FONT SIZE="-1">PROG</FONT> after setting up
the specified environment
<P>
<PRE>
-, -i Start with an empty environment
-u Remove variable from the environment
</PRE>
<DT id="52"><B>expand</B><DD>
expand [-i] [-t N] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Convert tabs to spaces, writing to stdout
<P>
<PRE>
-i Don't convert tabs after non blanks
-t Tabstops every N chars
</PRE>
<DT id="53"><B>expr</B><DD>
expr <FONT SIZE="-1">EXPRESSION</FONT>
<P>
Print the value of <FONT SIZE="-1">EXPRESSION</FONT> to stdout
<P>
<FONT SIZE="-1">EXPRESSION</FONT> may be:
<P>
<PRE>
ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2
ARG1 &amp; ARG2 ARG1 if neither argument is null or 0, otherwise 0
ARG1 &lt; ARG2 1 if ARG1 is less than ARG2, else 0. Similarly:
ARG1 &lt;= ARG2
ARG1 = ARG2
ARG1 != ARG2
ARG1 &gt;= ARG2
ARG1 &gt; ARG2
ARG1 + ARG2 Sum of ARG1 and ARG2. Similarly:
ARG1 - ARG2
ARG1 * ARG2
ARG1 / ARG2
ARG1 % ARG2
STRING : REGEXP Anchored pattern match of REGEXP in STRING
match STRING REGEXP Same as STRING : REGEXP
substr STRING POS LENGTH Substring of STRING, POS counted from 1
index STRING CHARS Index in STRING where any CHARS is found, or 0
length STRING Length of STRING
quote TOKEN Interpret TOKEN as a string, even if
it is a keyword like 'match' or an
operator like '/'
(EXPRESSION) Value of EXPRESSION
</PRE>
<P>
Beware that many operators need to be escaped or quoted for shells.
Comparisons are arithmetic if both ARGs are numbers, else
lexicographical. Pattern matches return the string matched between
\( and \) or null; if \( and \) are not used, they return the number
of characters matched or 0.
<DT id="54"><B>factor</B><DD>
factor [<FONT SIZE="-1">NUMBER</FONT>]...
<P>
Print prime factors
<DT id="55"><B>fallocate</B><DD>
fallocate [-o <FONT SIZE="-1">OFS</FONT>] -l <FONT SIZE="-1">LEN FILE</FONT>
<P>
Preallocate space for <FONT SIZE="-1">FILE</FONT>
<P>
<PRE>
-o OFS Offset of range
-l LEN Length of range
</PRE>
<DT id="56"><B>fatattr</B><DD>
fatattr [-+rhsvda] <FONT SIZE="-1">FILE...</FONT>
<P>
Change file attributes on <FONT SIZE="-1">FAT</FONT> filesystem
<P>
<PRE>
- Clear attributes
+ Set attributes
r Read only
h Hidden
s System
v Volume label
d Directory
a Archive
</PRE>
<DT id="57"><B>fdisk</B><DD>
fdisk [-ul] [-C <FONT SIZE="-1">CYLINDERS</FONT>] [-H <FONT SIZE="-1">HEADS</FONT>] [-S <FONT SIZE="-1">SECTORS</FONT>] [-b <FONT SIZE="-1">SSZ</FONT>] <FONT SIZE="-1">DISK</FONT>
<P>
Change partition table
<P>
<PRE>
-u Start and End are in sectors (instead of cylinders)
-l Show partition table for each DISK, then exit
-b 2048 (for certain MO disks) use 2048-byte sectors
-C CYLINDERS Set number of cylinders/heads/sectors
-H HEADS Typically 255
-S SECTORS Typically 63
</PRE>
<DT id="58"><B>find</B><DD>
find [-HL] [<FONT SIZE="-1">PATH</FONT>]... [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">ACTIONS</FONT>]
<P>
Search for files and perform actions on them.
First failed action stops processing of current file.
Defaults: <FONT SIZE="-1">PATH</FONT> is current directory, action is '-print'
<P>
<PRE>
-L,-follow Follow symlinks
-H ...on command line only
-xdev Don't descend directories on other filesystems
-maxdepth N Descend at most N levels. -maxdepth 0 applies
actions to command line arguments only
-mindepth N Don't act on first N levels
-depth Act on directory *after* traversing it
</PRE>
<P>
Actions:
<P>
<PRE>
( ACTIONS ) Group actions for -o / -a
! ACT Invert ACT's success/failure
ACT1 [-a] ACT2 If ACT1 fails, stop, else do ACT2
ACT1 -o ACT2 If ACT1 succeeds, stop, else do ACT2
Note: -a has higher priority than -o
-name PATTERN Match file name (w/o directory name) to PATTERN
-iname PATTERN Case insensitive -name
-path PATTERN Match path to PATTERN
-ipath PATTERN Case insensitive -path
-regex PATTERN Match path to regex PATTERN
-type X File type is X (one of: f,d,l,b,c,s,p)
-executable File is executable
-perm MASK At least one mask bit (+MASK), all bits (-MASK),
or exactly MASK bits are set in file's mode
-mtime DAYS mtime is greater than (+N), less than (-N),
or exactly N days in the past
-mmin MINS mtime is greater than (+N), less than (-N),
or exactly N minutes in the past
-newer FILE mtime is more recent than FILE's
-inum N File has inode number N
-user NAME/ID File is owned by given user
-group NAME/ID File is owned by given group
-size N[bck] File size is N (c:bytes,k:kbytes,b:512 bytes(def.))
+/-N: file size is bigger/smaller than N
-links N Number of links is greater than (+N), less than (-N),
or exactly N
-prune If current file is directory, don't descend into it
If none of the following actions is specified, -print is assumed
-print Print file name
-print0 Print file name, NUL terminated
-exec CMD ARG ; Run CMD with all instances of {} replaced by
file name. Fails if CMD exits with nonzero
-exec CMD ARG + Run CMD with {} replaced by list of file names
-quit Exit
</PRE>
<DT id="59"><B>fold</B><DD>
fold [-bs] [-w <FONT SIZE="-1">WIDTH</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Wrap input lines in each <FONT SIZE="-1">FILE</FONT> (or stdin), writing to stdout
<P>
<PRE>
-b Count bytes rather than columns
-s Break at spaces
-w Use WIDTH columns instead of 80
</PRE>
<DT id="60"><B>free</B><DD>
free [-b/k/m/g]
<P>
Display the amount of free and used system memory
<DT id="61"><B>freeramdisk</B><DD>
freeramdisk <FONT SIZE="-1">DEVICE</FONT>
<P>
Free all memory used by the specified ramdisk
<DT id="62"><B>fsfreeze</B><DD>
fsfreeze --[un]freeze <FONT SIZE="-1">MOUNTPOINT</FONT>
<P>
Flush and halt writes to <FONT SIZE="-1">MOUNTPOINT</FONT>
<DT id="63"><B>fstrim</B><DD>
fstrim [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">MOUNTPOINT</FONT>
<P>
<PRE>
-o,--offset OFFSET Offset in bytes to discard from
-l,--length LEN Bytes to discard
-m,--minimum MIN Minimum extent length
-v,--verbose Print number of discarded bytes
</PRE>
<DT id="64"><B>ftpget</B><DD>
ftpget [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">HOST</FONT> [<FONT SIZE="-1">LOCAL_FILE</FONT>] <FONT SIZE="-1">REMOTE_FILE</FONT>
<P>
Download a file via <FONT SIZE="-1">FTP</FONT>
<P>
<PRE>
-c Continue previous transfer
-v Verbose
-u USER Username
-p PASS Password
-P NUM Port
</PRE>
<DT id="65"><B>ftpput</B><DD>
ftpput [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">HOST</FONT> [<FONT SIZE="-1">REMOTE_FILE</FONT>] <FONT SIZE="-1">LOCAL_FILE</FONT>
<P>
Upload a file to a <FONT SIZE="-1">FTP</FONT> server
<P>
<PRE>
-v Verbose
-u USER Username
-p PASS Password
-P NUM Port number
</PRE>
<DT id="66"><B>getopt</B><DD>
getopt [<FONT SIZE="-1">OPTIONS</FONT>] [--] <FONT SIZE="-1">OPTSTRING PARAMS</FONT>
<P>
<PRE>
-a Allow long options starting with single -
-l LOPT[,...] Long options to recognize
-n PROGNAME The name under which errors are reported
-o OPTSTRING Short options to recognize
-q No error messages on unrecognized options
-Q No normal output
-s SHELL Set shell quoting conventions
-T Version test (exits with 4)
-u Don't quote output
</PRE>
<P>
Example:
<P>
O=`getopt -l bb: --- ab:c:: ``$@''` || exit 1
eval set --- ``$O''
while true; do
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>case ``$1'' in<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>-a)<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>echo A; shift;;<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>-b|--bb) echo ``B:'$2'''; shift 2;;<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>-c)<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>case ``$2'' in<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>&quot;``)<TT>&nbsp;&nbsp;&nbsp;&nbsp;</TT>echo C; shift 2;;<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>*)<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>echo ''C:'$2'&quot;; shift 2;;<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>esac;;<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>--)<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>shift; break;;<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>*)<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>echo Error; exit 1;;<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>esac<BR>
done
<DT id="67"><B>getty</B><DD>
getty [<FONT SIZE="-1">OPTIONS</FONT>] BAUD_RATE[,BAUD_RATE]... <FONT SIZE="-1">TTY</FONT> [<FONT SIZE="-1">TERMTYPE</FONT>]
<P>
Open <FONT SIZE="-1">TTY,</FONT> prompt for login name, then invoke /bin/login
<P>
<PRE>
-h Enable hardware RTS/CTS flow control
-L Set CLOCAL (ignore Carrier Detect state)
-m Get baud rate from modem's CONNECT status message
-n Don't prompt for login name
-w Wait for CR or LF before sending /etc/issue
-i Don't display /etc/issue
-f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue
-l LOGIN Invoke LOGIN instead of /bin/login
-t SEC Terminate after SEC if no login name is read
-I INITSTR Send INITSTR before anything else
-H HOST Log HOST into the utmp file as the hostname
</PRE>
<P>
<FONT SIZE="-1">BAUD_RATE</FONT> of 0 leaves it unchanged
<DT id="68"><B>grep</B><DD>
grep [-HhnlLoqvsriwFEz] [-m N] [-A/B/C N] PATTERN/-e <FONT SIZE="-1">PATTERN..</FONT>./-f <FONT SIZE="-1">FILE</FONT> [<FONT SIZE="-1">FILE</FONT>]...
<P>
Search for <FONT SIZE="-1">PATTERN</FONT> in FILEs (or stdin)
<P>
<PRE>
-H Add 'filename:' prefix
-h Do not add 'filename:' prefix
-n Add 'line_no:' prefix
-l Show only names of files that match
-L Show only names of files that don't match
-c Show only count of matching lines
-o Show only the matching part of line
-q Quiet. Return 0 if PATTERN is found, 1 otherwise
-v Select non-matching lines
-s Suppress open and read errors
-r Recurse
-i Ignore case
-w Match whole words only
-x Match whole lines only
-F PATTERN is a literal (not regexp)
-E PATTERN is an extended regexp
-z Input is NUL terminated
-m N Match up to N times per file
-A N Print N lines of trailing context
-B N Print N lines of leading context
-C N Same as '-A N -B N'
-e PTRN Pattern to match
-f FILE Read pattern from file
</PRE>
<DT id="69"><B>groups</B><DD>
groups [<FONT SIZE="-1">USER</FONT>]
<P>
Print the group memberships of <FONT SIZE="-1">USER</FONT> or for the current process
<DT id="70"><B>gunzip</B><DD>
gunzip [-cfkt] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress FILEs (or stdin)
<P>
<PRE>
-c Write to stdout
-f Force
-k Keep input files
-t Test file integrity
</PRE>
<DT id="71"><B>gzip</B><DD>
gzip [-cfkdt] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Compress FILEs (or stdin)
<P>
<PRE>
-d Decompress
-t Test file integrity
-c Write to stdout
-f Force
-k Keep input files
</PRE>
<DT id="72"><B>halt</B><DD>
halt [-d <FONT SIZE="-1">DELAY</FONT>] [-n] [-f] [-w]
<P>
Halt the system
<P>
<PRE>
-d SEC Delay interval
-n Do not sync
-f Force (don't go through init)
-w Only write a wtmp record
</PRE>
<DT id="73"><B>head</B><DD>
head [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print first 10 lines of each <FONT SIZE="-1">FILE</FONT> (or stdin) to stdout.
With more than one <FONT SIZE="-1">FILE,</FONT> precede each with a filename header.
<P>
<PRE>
-n N[kbm] Print first N lines
-n -N[kbm] Print all except N last lines
-c [-]N[kbm] Print first N bytes
-q Never print headers
-v Always print headers
</PRE>
<P>
N may be suffixed by k (x1024), b (x512), or m (x1024^2).
<DT id="74"><B>hexdump</B><DD>
hexdump [-bcCdefnosvx] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Display FILEs (or stdin) in a user specified format
<P>
<PRE>
-b 1-byte octal display
-c 1-byte character display
-d 2-byte decimal display
-o 2-byte octal display
-x 2-byte hex display
-C hex+ASCII 16 bytes per line
-v Show all (no dup folding)
-e FORMAT_STR Example: '16/1 &quot;%02x|&quot;&quot;\n&quot;'
-f FORMAT_FILE
-n LENGTH Show only first LENGTH bytes
-s OFFSET Skip OFFSET bytes
</PRE>
<DT id="75"><B>hostid</B><DD>
hostid
<P>
Print out a unique 32-bit identifier for the machine
<DT id="76"><B>hostname</B><DD>
hostname [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">HOSTNAME</FONT> | -F <FONT SIZE="-1">FILE</FONT>]
<P>
Get or set hostname or <FONT SIZE="-1">DNS</FONT> domain name
<P>
<PRE>
-s Short
-i Addresses for the hostname
-d DNS domain name
-f Fully qualified domain name
-F FILE Use FILE's content as hostname
</PRE>
<DT id="77"><B>httpd</B><DD>
httpd [-ifv[v]] [-c <FONT SIZE="-1">CONFFILE</FONT>] [-p [<FONT SIZE="-1">IP:</FONT>]PORT] [-u USER[:GRP]] [-r <FONT SIZE="-1">REALM</FONT>] [-h <FONT SIZE="-1">HOME</FONT>]
or httpd -d/-e/-m <FONT SIZE="-1">STRING</FONT>
<P>
Listen for incoming <FONT SIZE="-1">HTTP</FONT> requests
<P>
<PRE>
-i Inetd mode
-f Don't daemonize
-v[v] Verbose
-p [IP:]PORT Bind to IP:PORT (default *:80)
-u USER[:GRP] Set uid/gid after binding to port
-r REALM Authentication Realm for Basic Authentication
-h HOME Home directory (default .)
-c FILE Configuration file (default {/etc,HOME}/httpd.conf)
-m STRING MD5 crypt STRING
-e STRING HTML encode STRING
-d STRING URL decode STRING
</PRE>
<DT id="78"><B>hwclock</B><DD>
hwclock [-r|--show] [-s|--hctosys] [-w|--systohc] [--systz] [--localtime] [-u|--utc] [-f|--rtc <FONT SIZE="-1">FILE</FONT>]
<P>
Query and set hardware clock (<FONT SIZE="-1">RTC</FONT>)
<P>
<PRE>
-r Show hardware clock time
-s Set system time from hardware clock
-w Set hardware clock from system time
--systz Set in-kernel timezone, correct system time
if hardware clock is in local time
-u Assume hardware clock is kept in UTC
--localtime Assume hardware clock is kept in local time
-f FILE Use specified device (e.g. /dev/rtc2)
</PRE>
<DT id="79"><B>i2cdetect</B><DD>
i2cdetect -l | -F I2CBUS | [-ya] [-q|-r] I2CBUS [<FONT SIZE="-1">FIRST LAST</FONT>]
<P>
Detect I2C chips
<P>
<PRE>
-l List installed buses
-F BUS# List functionalities on this bus
-y Disable interactive mode
-a Force scanning of non-regular addresses
-q Use smbus quick write commands for probing (default)
-r Use smbus read byte commands for probing
FIRST and LAST limit probing range
</PRE>
<DT id="80"><B>i2cdump</B><DD>
i2cdump [-fy] [-r <FONT SIZE="-1">FIRST-LAST</FONT>] <FONT SIZE="-1">BUS ADDR</FONT> [<FONT SIZE="-1">MODE</FONT>]
<P>
Examine I2C registers
<P>
<PRE>
I2CBUS I2C bus number
ADDRESS 0x03-0x77
MODE is:
b Byte (default)
w Word
W Word on even register addresses
i I2C block
s SMBus block
c Consecutive byte
Append p for SMBus PEC
-f Force access
-y Disable interactive mode
-r Limit the number of registers being accessed
</PRE>
<DT id="81"><B>i2cget</B><DD>
i2cget [-fy] <FONT SIZE="-1">BUS</FONT> CHIP-ADDRESS [<FONT SIZE="-1">DATA-ADDRESS</FONT> [<FONT SIZE="-1">MODE</FONT>]]
<P>
Read from I2C/SMBus chip registers
<P>
<PRE>
I2CBUS I2C bus number
ADDRESS 0x03-0x77
MODE is:
b Read byte data (default)
w Read word data
c Write byte/read byte
Append p for SMBus PEC
-f Force access
-y Disable interactive mode
</PRE>
<DT id="82"><B>i2cset</B><DD>
i2cset [-fy] [-m <FONT SIZE="-1">MASK</FONT>] <FONT SIZE="-1">BUS</FONT> CHIP-ADDRESS DATA-ADDRESS [<FONT SIZE="-1">VALUE</FONT>] ... [<FONT SIZE="-1">MODE</FONT>]
<P>
Set I2C registers
<P>
<PRE>
I2CBUS I2C bus number
ADDRESS 0x03-0x77
MODE is:
c Byte, no value
b Byte data (default)
w Word data
i I2C block data
s SMBus block data
Append p for SMBus PEC
-f Force access
-y Disable interactive mode
-r Read back and compare the result
-m MASK Mask specifying which bits to write
</PRE>
<DT id="83"><B>id</B><DD>
id [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">USER</FONT>]
<P>
Print information about <FONT SIZE="-1">USER</FONT> or the current user
<P>
<PRE>
-u User ID
-g Group ID
-G Supplementary group IDs
-n Print names instead of numbers
-r Print real ID instead of effective ID
</PRE>
<DT id="84"><B>ifconfig</B><DD>
ifconfig [-a] interface [address]
<P>
Configure a network interface
<P>
<PRE>
[add ADDRESS[/PREFIXLEN]]
[del ADDRESS[/PREFIXLEN]]
[[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]
[netmask ADDRESS] [dstaddr ADDRESS]
[outfill NN] [keepalive NN]
[hw ether|infiniband ADDRESS] [metric NN] [mtu NN]
[[-]trailers] [[-]arp] [[-]allmulti]
[multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]
[mem_start NN] [io_addr NN] [irq NN]
[up|down] ...
</PRE>
<DT id="85"><B>ifdown</B><DD>
ifdown [-anmvf] [-i <FONT SIZE="-1">FILE</FONT>] <FONT SIZE="-1">IFACE...</FONT>
<P>
<PRE>
-a Deconfigure all interfaces
-i FILE Use FILE for interface definitions
-n Print out what would happen, but don't do it
(note: doesn't disable mappings)
-m Don't run any mappings
-v Print out what would happen before doing it
-f Force deconfiguration
</PRE>
<DT id="86"><B>ifup</B><DD>
ifup [-anmvf] [-i <FONT SIZE="-1">FILE</FONT>] <FONT SIZE="-1">IFACE...</FONT>
<P>
<PRE>
-a Configure all interfaces
-i FILE Use FILE instead of /etc/network/interfaces
-n Print out what would happen, but don't do it
(note: doesn't disable mappings)
-m Don't run any mappings
-v Print out what would happen before doing it
-f Force configuration
</PRE>
<DT id="87"><B>init</B><DD>
init
<P>
Init is the first process started during boot. It never exits.
It (re)spawns children according to /etc/inittab.
<DT id="88"><B>insmod</B><DD>
insmod <FONT SIZE="-1">FILE</FONT> [SYMBOL=VALUE]...
<P>
Load kernel module
<DT id="89"><B>ionice</B><DD>
ionice [-c 1-3] [-n 0-7] [-p <FONT SIZE="-1">PID</FONT>] [<FONT SIZE="-1">PROG</FONT>]
<P>
Change I/O priority and class
<P>
<PRE>
-c Class. 1:realtime 2:best-effort 3:idle
-n Priority
</PRE>
<DT id="90"><B>ip</B><DD>
ip [<FONT SIZE="-1">OPTIONS</FONT>] address|route|link|tunnel|neigh|rule [<FONT SIZE="-1">ARGS</FONT>]
<P>
<FONT SIZE="-1">OPTIONS</FONT> := -f[amily] inet|inet6|link | -o[neline]
<P>
ip addr add|del <FONT SIZE="-1">IFADDR</FONT> dev <FONT SIZE="-1">IFACE</FONT> | show|flush [dev <FONT SIZE="-1">IFACE</FONT>] [to <FONT SIZE="-1">PREFIX</FONT>]
ip route list|flush|add|del|change|append|replace|test <FONT SIZE="-1">ROUTE</FONT>
ip link set <FONT SIZE="-1">IFACE</FONT> [up|down] [arp on|off] [multicast on|off]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[promisc on|off] [mtu <FONT SIZE="-1">NUM</FONT>] [name <FONT SIZE="-1">NAME</FONT>] [qlen <FONT SIZE="-1">NUM</FONT>] [address <FONT SIZE="-1">MAC</FONT>]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[master <FONT SIZE="-1">IFACE</FONT> | nomaster]<BR>
ip tunnel add|change|del|show [<FONT SIZE="-1">NAME</FONT>]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[mode ipip|gre|sit] [remote <FONT SIZE="-1">ADDR</FONT>] [local <FONT SIZE="-1">ADDR</FONT>] [ttl <FONT SIZE="-1">TTL</FONT>]<BR>
ip neigh show|flush [to <FONT SIZE="-1">PREFIX</FONT>] [dev <FONT SIZE="-1">DEV</FONT>] [nud <FONT SIZE="-1">STATE</FONT>]
ip rule [list] | add|del <FONT SIZE="-1">SELECTOR ACTION</FONT>
<DT id="91"><B>ipcalc</B><DD>
ipcalc [<FONT SIZE="-1">OPTIONS</FONT>] ADDRESS[/PREFIX] [<FONT SIZE="-1">NETMASK</FONT>]
<P>
Calculate and display network settings from <FONT SIZE="-1">IP</FONT> address
<P>
<PRE>
-b Broadcast address
-n Network address
-m Default netmask for IP
-p Prefix for IP/NETMASK
-h Resolved host name
-s No error messages
</PRE>
<DT id="92"><B>ipneigh</B><DD>
ipneigh show|flush [to <FONT SIZE="-1">PREFIX</FONT>] [dev <FONT SIZE="-1">DEV</FONT>] [nud <FONT SIZE="-1">STATE</FONT>]
<DT id="93"><B>kill</B><DD>
kill [-l] [-SIG] <FONT SIZE="-1">PID...</FONT>
<P>
Send a signal (default: <FONT SIZE="-1">TERM</FONT>) to given PIDs
<P>
<PRE>
-l List all signal names and numbers
</PRE>
<DT id="94"><B>killall</B><DD>
killall [-l] [-q] [-SIG] <FONT SIZE="-1">PROCESS_NAME...</FONT>
<P>
Send a signal (default: <FONT SIZE="-1">TERM</FONT>) to given processes
<P>
<PRE>
-l List all signal names and numbers
-q Don't complain if no processes were killed
</PRE>
<DT id="95"><B>klogd</B><DD>
klogd [-c N] [-n]
<P>
Log kernel messages to syslog
<P>
<PRE>
-c N Print to console messages more urgent than prio N (1-8)
-n Run in foreground
</PRE>
<DT id="96"><B>last</B><DD>
last
<P>
Show listing of the last users that logged into the system
<DT id="97"><B>less</B><DD>
less [-EFIMmNSRh~] [<FONT SIZE="-1">FILE</FONT>]...
<P>
View <FONT SIZE="-1">FILE</FONT> (or stdin) one screenful at a time
<P>
<PRE>
-E Quit once the end of a file is reached
-F Quit if entire file fits on first screen
-I Ignore case in all searches
-M,-m Display status line with line numbers
and percentage through the file
-N Prefix line number to each line
-S Truncate long lines
-R Remove color escape codes in input
-~ Suppress ~s displayed past EOF
</PRE>
<DT id="98"><B>link</B><DD>
link <FONT SIZE="-1">FILE LINK</FONT>
<P>
Create hard <FONT SIZE="-1">LINK</FONT> to <FONT SIZE="-1">FILE</FONT>
<DT id="99"><B>ln</B><DD>
ln [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">TARGET...</FONT> LINK|DIR
<P>
Create a link <FONT SIZE="-1">LINK</FONT> or <FONT SIZE="-1">DIR/TARGET</FONT> to the specified <FONT SIZE="-1">TARGET</FONT>(s)
<P>
<PRE>
-s Make symlinks instead of hardlinks
-f Remove existing destinations
-n Don't dereference symlinks - treat like normal file
-b Make a backup of the target (if exists) before link operation
-S suf Use suffix instead of ~ when making backup files
-T 2nd arg must be a DIR
-v Verbose
</PRE>
<DT id="100"><B>loadfont</B><DD>
loadfont &lt; font
<P>
Load a console font from stdin
<DT id="101"><B>loadkmap</B><DD>
loadkmap &lt; keymap
<P>
Load a binary keyboard translation table from stdin
<DT id="102"><B>logger</B><DD>
logger [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">MESSAGE</FONT>]
<P>
Write <FONT SIZE="-1">MESSAGE</FONT> (or stdin) to syslog
<P>
<PRE>
-s Log to stderr as well as the system log
-t TAG Log using the specified tag (defaults to user name)
-p PRIO Priority (numeric or facility.level pair)
</PRE>
<DT id="103"><B>login</B><DD>
login [-p] [-h <FONT SIZE="-1">HOST</FONT>] [[-f] <FONT SIZE="-1">USER</FONT>]
<P>
Begin a new session on the system
<P>
<PRE>
-f Don't authenticate (user already authenticated)
-h HOST Host user came from (for network logins)
-p Preserve environment
</PRE>
<DT id="104"><B>logname</B><DD>
logname
<P>
Print the name of the current user
<DT id="105"><B>logread</B><DD>
logread [-fF]
<P>
Show messages in syslogd's circular buffer
<P>
<PRE>
-f Output data as log grows
-F Same as -f, but dump buffer first
</PRE>
<DT id="106"><B>losetup</B><DD>
losetup [-r] [-o <FONT SIZE="-1">OFS</FONT>] {-f|LOOPDEV} <FONT SIZE="-1">FILE</FONT> - associate loop devices
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>losetup -d <FONT SIZE="-1">LOOPDEV</FONT> - disassociate<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>losetup -a - show status<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>losetup -f - show next free loop device<BR>
<P>
<PRE>
-o OFS Start OFS bytes into FILE
-r Read-only
-f Show/use next free loop device
</PRE>
<DT id="107"><B>ls</B><DD>
ls [-1AaCxdLHRFplinshrSXvctu] [-w <FONT SIZE="-1">WIDTH</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
List directory contents
<P>
<PRE>
-1 One column output
-a Include entries which start with .
-A Like -a, but exclude . and ..
-x List by lines
-d List directory entries instead of contents
-L Follow symlinks
-H Follow symlinks on command line
-R Recurse
-p Append / to dir entries
-F Append indicator (one of */=@|) to entries
-l Long listing format
-i List inode numbers
-n List numeric UIDs and GIDs instead of names
-s List allocated blocks
-lc List ctime
-lu List atime
--full-time List full date and time
-h Human readable sizes (1K 243M 2G)
--group-directories-first
-S Sort by size
-X Sort by extension
-v Sort by version
-t Sort by mtime
-tc Sort by ctime
-tu Sort by atime
-r Reverse sort order
-w N Format N columns wide
--color[={always,never,auto}] Control coloring
</PRE>
<DT id="108"><B>lsmod</B><DD>
lsmod
<P>
List loaded kernel modules
<DT id="109"><B>lzcat</B><DD>
lzcat [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress to stdout
<DT id="110"><B>lzma</B><DD>
lzma -d [-cfk] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress <FONT SIZE="-1">FILE</FONT> (or stdin)
<P>
<PRE>
-d Decompress
-c Write to stdout
-f Force
-k Keep input files
</PRE>
<DT id="111"><B>lzop</B><DD>
lzop [-cfUvd123456789CF] [<FONT SIZE="-1">FILE</FONT>]...
<P>
<PRE>
-1..9 Compression level
-d Decompress
-c Write to stdout
-f Force
-U Delete input files
-v Verbose
-F Don't store or verify checksum
-C Also write checksum of compressed block
</PRE>
<DT id="112"><B>md5sum</B><DD>
md5sum [-c[sw]] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print or check <FONT SIZE="-1">MD5</FONT> checksums
<P>
<PRE>
-c Check sums against list in FILEs
-s Don't output anything, status code shows success
-w Warn about improperly formatted checksum lines
</PRE>
<DT id="113"><B>mdev</B><DD>
mdev [-s]
<P>
mdev -s is to be run during boot to scan /sys and populate /dev.
<P>
Bare mdev is a kernel hotplug helper. To activate it:
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>echo /sbin/mdev &gt;/proc/sys/kernel/hotplug<BR>
<P>
It uses /etc/mdev.conf with lines
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-][ENV=regex;]...DEVNAME <FONT SIZE="-1">UID:GID PERM</FONT> [&gt;|=PATH]|[!] [@|$|*PROG]<BR>
where <FONT SIZE="-1">DEVNAME</FONT> is device name regex, <TT>@major</TT>,minor[-minor2], or
environment variable regex. A common use of the latter is
to load modules for hotplugged devices:
<P>
<PRE>
$MODALIAS=.* 0:0 660 @modprobe &quot;$MODALIAS&quot;
</PRE>
<P>
If /dev/mdev.seq file exists, mdev will wait for its value
to match <TT>$SEQNUM</TT> variable. This prevents plug/unplug races.
To activate this feature, create empty /dev/mdev.seq at boot.
<P>
If /dev/mdev.log file exists, debug log will be appended to it.
<DT id="114"><B>microcom</B><DD>
microcom [-d <FONT SIZE="-1">DELAY</FONT>] [-t <FONT SIZE="-1">TIMEOUT</FONT>] [-s <FONT SIZE="-1">SPEED</FONT>] [-X] <FONT SIZE="-1">TTY</FONT>
<P>
Copy bytes for stdin to <FONT SIZE="-1">TTY</FONT> and from <FONT SIZE="-1">TTY</FONT> to stdout
<P>
<PRE>
-d Wait up to DELAY ms for TTY output before sending every
next byte to it
-t Exit if both stdin and TTY are silent for TIMEOUT ms
-s Set serial line to SPEED
-X Disable special meaning of NUL and Ctrl-X from stdin
</PRE>
<DT id="115"><B>mkdir</B><DD>
mkdir [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">DIRECTORY...</FONT>
<P>
Create <FONT SIZE="-1">DIRECTORY</FONT>
<P>
<PRE>
-m MODE Mode
-p No error if exists; make parent directories as needed
</PRE>
<DT id="116"><B>mkdosfs</B><DD>
mkdosfs [-v] [-n <FONT SIZE="-1">LABEL</FONT>] <FONT SIZE="-1">BLOCKDEV</FONT> [<FONT SIZE="-1">KBYTES</FONT>]
<P>
Make a <FONT SIZE="-1">FAT32</FONT> filesystem
<P>
<PRE>
-v Verbose
-n LBL Volume label
</PRE>
<DT id="117"><B>mke2fs</B><DD>
mke2fs [-Fn] [-b <FONT SIZE="-1">BLK_SIZE</FONT>] [-i <FONT SIZE="-1">INODE_RATIO</FONT>] [-I <FONT SIZE="-1">INODE_SIZE</FONT>] [-m <FONT SIZE="-1">RESERVED_PERCENT</FONT>] [-L <FONT SIZE="-1">LABEL</FONT>] <FONT SIZE="-1">BLOCKDEV</FONT> [<FONT SIZE="-1">KBYTES</FONT>]
<P>
<PRE>
-b BLK_SIZE Block size, bytes
-F Force
-i RATIO Max number of files is filesystem_size / RATIO
-I BYTES Inode size (min 128)
-L LBL Volume label
-m PERCENT Percent of blocks to reserve for admin
-n Dry run
</PRE>
<DT id="118"><B>mkfifo</B><DD>
mkfifo [-m <FONT SIZE="-1">MODE</FONT>] <FONT SIZE="-1">NAME</FONT>
<P>
Create named pipe
<P>
<PRE>
-m MODE Mode (default a=rw)
</PRE>
<DT id="119"><B>mknod</B><DD>
mknod [-m <FONT SIZE="-1">MODE</FONT>] <FONT SIZE="-1">NAME TYPE</FONT> [<FONT SIZE="-1">MAJOR MINOR</FONT>]
<P>
Create a special file (block, character, or pipe)
<P>
<PRE>
-m MODE Creation mode (default a=rw)
TYPE:
b Block device
c or u Character device
p Named pipe (MAJOR MINOR must be omitted)
</PRE>
<DT id="120"><B>mkpasswd</B><DD>
mkpasswd [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">PASSWORD</FONT>] [<FONT SIZE="-1">SALT</FONT>]
<P>
Print <B><A HREF="/cgi-bin/man/man2html?3+crypt">crypt</A></B>(3) hashed <FONT SIZE="-1">PASSWORD</FONT>
<P>
<PRE>
-P,--password-fd N Read password from fd N
-m,--method TYPE des,md5,sha256/512 (default sha256)
-S,--salt SALT
</PRE>
<DT id="121"><B>mkswap</B><DD>
mkswap [-L <FONT SIZE="-1">LBL</FONT>] <FONT SIZE="-1">BLOCKDEV</FONT> [<FONT SIZE="-1">KBYTES</FONT>]
<P>
Prepare <FONT SIZE="-1">BLOCKDEV</FONT> to be used as swap partition
<P>
<PRE>
-L LBL Label
</PRE>
<DT id="122"><B>mktemp</B><DD>
mktemp [-dt] [-p <FONT SIZE="-1">DIR</FONT>] [<FONT SIZE="-1">TEMPLATE</FONT>]
<P>
Create a temporary file with name based on <FONT SIZE="-1">TEMPLATE</FONT> and print its name.
<FONT SIZE="-1">TEMPLATE</FONT> must end with <FONT SIZE="-1">XXXXXX</FONT> (e.g. [/dir/]nameXXXXXX).
Without <FONT SIZE="-1">TEMPLATE,</FONT> -t tmp.XXXXXX is assumed.
<P>
<PRE>
-d Make directory, not file
-q Fail silently on errors
-t Prepend base directory name to TEMPLATE
-p DIR Use DIR as a base directory (implies -t)
-u Do not create anything; print a name
</PRE>
<P>
Base directory is: -p <FONT SIZE="-1">DIR,</FONT> else <TT>$TMPDIR</TT>, else /tmp
<DT id="123"><B>modinfo</B><DD>
modinfo [-adlpn0] [-F keyword] <FONT SIZE="-1">MODULE</FONT>
<P>
<PRE>
-a Shortcut for '-F author'
-d Shortcut for '-F description'
-l Shortcut for '-F license'
-p Shortcut for '-F parm'
-F keyword Keyword to look for
-0 Separate output with NULs
</PRE>
<DT id="124"><B>modprobe</B><DD>
modprobe [-alrqvsDb] <FONT SIZE="-1">MODULE</FONT> [SYMBOL=VALUE]...
<P>
<PRE>
-a Load multiple MODULEs
-l List (MODULE is a pattern)
-r Remove MODULE (stacks) or do autoclean
-q Quiet
-v Verbose
-s Log to syslog
-D Show dependencies
-b Apply blacklist to module names too
</PRE>
<DT id="125"><B>more</B><DD>
more [<FONT SIZE="-1">FILE</FONT>]...
<P>
View <FONT SIZE="-1">FILE</FONT> (or stdin) one screenful at a time
<DT id="126"><B>mount</B><DD>
mount [<FONT SIZE="-1">OPTIONS</FONT>] [-o <FONT SIZE="-1">OPT</FONT>] <FONT SIZE="-1">DEVICE NODE</FONT>
<P>
Mount a filesystem. Filesystem autodetection requires /proc.
<P>
<PRE>
-a Mount all filesystems in fstab
-f Dry run
-i Don't run mount helper
-r Read-only mount
-t FSTYPE[,...] Filesystem type(s)
-T FILE Read FILE instead of /etc/fstab
-O OPT Mount only filesystems with option OPT (-a only)
-o OPT:
loop Ignored (loop devices are autodetected)
[a]sync Writes are [a]synchronous
[no]atime Disable/enable updates to inode access times
[no]diratime Disable/enable atime updates to directories
[no]relatime Disable/enable atime updates relative to modification time
[no]dev (Dis)allow use of special device files
[no]exec (Dis)allow use of executable files
[no]suid (Dis)allow set-user-id-root programs
[r]shared Convert [recursively] to a shared subtree
[r]slave Convert [recursively] to a slave subtree
[r]private Convert [recursively] to a private subtree
[un]bindable Make mount point [un]able to be bind mounted
[r]bind Bind a file or directory [recursively] to another location
move Relocate an existing mount point
remount Remount a mounted filesystem, changing flags
ro Same as -r
</PRE>
<P>
There are filesystem-specific -o flags.
<DT id="127"><B>mt</B><DD>
mt [-f device] opcode value
<P>
Control magnetic tape drive operation
<P>
Available Opcodes:
<P>
bsf bsfm bsr bss datacompression drvbuffer eof eom erase
fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2
ras3 reset retension rewind rewoffline seek setblk setdensity
setpart tell unload unlock weof wset
<DT id="128"><B>mv</B><DD>
mv [-fin] <FONT SIZE="-1">SOURCE DEST</FONT>
or: mv [-fin] <FONT SIZE="-1">SOURCE... DIRECTORY</FONT>
<P>
Rename <FONT SIZE="-1">SOURCE</FONT> to <FONT SIZE="-1">DEST,</FONT> or move <FONT SIZE="-1">SOURCE</FONT>(s) to <FONT SIZE="-1">DIRECTORY</FONT>
<P>
<PRE>
-f Don't prompt before overwriting
-i Interactive, prompt before overwrite
-n Don't overwrite an existing file
</PRE>
<DT id="129"><B>nameif</B><DD>
nameif [-s] [-c <FONT SIZE="-1">FILE</FONT>] [<FONT SIZE="-1">IFNAME HWADDR</FONT>]...
<P>
Rename network interface while it in the down state.
The device with address <FONT SIZE="-1">HWADDR</FONT> is renamed to <FONT SIZE="-1">IFACE.</FONT>
<P>
<PRE>
-c FILE Configuration file (default: /etc/mactab)
-s Log to syslog
</PRE>
<DT id="130"><B>nc</B><DD>
nc [-iN] [-wN] [-l] [-p <FONT SIZE="-1">PORT</FONT>] [-f FILE|IPADDR <FONT SIZE="-1">PORT</FONT>] [-e <FONT SIZE="-1">PROG</FONT>]
<P>
Open a pipe to <FONT SIZE="-1">IP:PORT</FONT> or <FONT SIZE="-1">FILE</FONT>
<P>
<PRE>
-l Listen mode, for inbound connects
(use -ll with -e for persistent server)
-p PORT Local port
-w SEC Connect timeout
-i SEC Delay interval for lines sent
-f FILE Use file (ala /dev/ttyS0) instead of network
-e PROG Run PROG after connect
</PRE>
<DT id="131"><B>netstat</B><DD>
netstat [-ral] [-tuwx] [-en]
<P>
Display networking information
<P>
<PRE>
-r Routing table
-a All sockets
-l Listening sockets
Else: connected sockets
-t TCP sockets
-u UDP sockets
-w Raw sockets
-x Unix sockets
Else: all socket types
-e Other/more information
-n Don't resolve names
</PRE>
<DT id="132"><B>nl</B><DD>
nl [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Write FILEs to standard output with line numbers added
<P>
<PRE>
-b STYLE Which lines to number - a: all, t: nonempty, n: none
-i N Line number increment
-s STRING Use STRING as line number separator
-v N Start from N
-w N Width of line numbers
</PRE>
<DT id="133"><B>nologin</B><DD>
nologin
<P>
Politely refuse a login
<DT id="134"><B>nproc</B><DD>
nproc --all --ignore=N
<P>
Print number of available CPUs
<P>
<PRE>
--all Number of installed CPUs
--ignore=N Exclude N CPUs
</PRE>
<DT id="135"><B>nsenter</B><DD>
nsenter [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">PROG</FONT> [<FONT SIZE="-1">ARGS</FONT>]]
<P>
<PRE>
-t PID Target process to get namespaces from
-m[FILE] Enter mount namespace
-u[FILE] Enter UTS namespace (hostname etc)
-i[FILE] Enter System V IPC namespace
-n[FILE] Enter network namespace
-p[FILE] Enter pid namespace
-U[FILE] Enter user namespace
-S UID Set uid in entered namespace
-G GID Set gid in entered namespace
--preserve-credentials Don't touch uids or gids
-r[DIR] Set root directory
-w[DIR] Set working directory
-F Don't fork before exec'ing PROG
</PRE>
<DT id="136"><B>nslookup</B><DD>
nslookup [-type=QUERY_TYPE] [-debug] <FONT SIZE="-1">HOST</FONT> [<FONT SIZE="-1">DNS_SERVER</FONT>]
<P>
Query <FONT SIZE="-1">DNS</FONT> about <FONT SIZE="-1">HOST</FONT>
<P>
<FONT SIZE="-1">QUERY_TYPE:</FONT> soa,ns,a,aaaa,cname,mx,txt,ptr,any
<DT id="137"><B>nuke</B><DD>
nuke <FONT SIZE="-1">DIR...</FONT>
<P>
Remove DIRs
<DT id="138"><B>od</B><DD>
od [-abcdfhilovxs] [-t <FONT SIZE="-1">TYPE</FONT>] [-A <FONT SIZE="-1">RADIX</FONT>] [-N <FONT SIZE="-1">SIZE</FONT>] [-j <FONT SIZE="-1">SKIP</FONT>] [-S <FONT SIZE="-1">MINSTR</FONT>] [-w <FONT SIZE="-1">WIDTH</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print FILEs (or stdin) unambiguously, as octal bytes by default
<DT id="139"><B>openvt</B><DD>
openvt [-c N] [-sw] [<FONT SIZE="-1">PROG ARGS</FONT>]
<P>
Start <FONT SIZE="-1">PROG</FONT> on a new virtual terminal
<P>
<PRE>
-c N Use specified VT
-s Switch to the VT
-w Wait for PROG to exit
</PRE>
<DT id="140"><B>partprobe</B><DD>
partprobe <FONT SIZE="-1">DEVICE...</FONT>
<P>
Ask kernel to rescan partition table
<DT id="141"><B>passwd</B><DD>
passwd [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">USER</FONT>]
<P>
Change <FONT SIZE="-1">USER</FONT>'s password (default: current user)
<P>
<PRE>
-a ALG des,md5,sha256/512 (default sha256)
-d Set password to ''
-l Lock (disable) account
-u Unlock (enable) account
</PRE>
<DT id="142"><B>paste</B><DD>
paste [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Paste lines from each input file, separated with tab
<P>
<PRE>
-d LIST Use delimiters from LIST, not tab
-s Serial: one file at a time
</PRE>
<DT id="143"><B>patch</B><DD>
patch [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">ORIGFILE</FONT> [<FONT SIZE="-1">PATCHFILE</FONT>]]
<P>
<PRE>
-p N Strip N leading components from file names
-i DIFF Read DIFF instead of stdin
-R Reverse patch
-N Ignore already applied patches
-E Remove output files if they become empty
--dry-run Don't actually change files
</PRE>
<DT id="144"><B>pidof</B><DD>
pidof [<FONT SIZE="-1">NAME</FONT>]...
<P>
List PIDs of all processes with names that match NAMEs
<DT id="145"><B>ping</B><DD>
ping [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">HOST</FONT>
<P>
Send <FONT SIZE="-1">ICMP ECHO_REQUEST</FONT> packets to network hosts
<P>
<PRE>
-4,-6 Force IP or IPv6 name resolution
-c CNT Send only CNT pings
-s SIZE Send SIZE data bytes in packets (default 56)
-i SECS Interval
-A Ping as soon as reply is recevied
-t TTL Set TTL
-I IFACE/IP Source interface or IP address
-W SEC Seconds to wait for the first response (default 10)
(after all -c CNT packets are sent)
-w SEC Seconds until ping exits (default:infinite)
(can exit earlier with -c CNT)
-q Quiet, only display output at start
and when finished
-p HEXBYTE Pattern to use for payload
</PRE>
<DT id="146"><B>ping6</B><DD>
ping6 [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">HOST</FONT>
<P>
Send <FONT SIZE="-1">ICMP ECHO_REQUEST</FONT> packets to network hosts
<P>
<PRE>
-c CNT Send only CNT pings
-s SIZE Send SIZE data bytes in packets (default 56)
-i SECS Interval
-A Ping as soon as reply is recevied
-I IFACE/IP Source interface or IP address
-q Quiet, only display output at start
and when finished
-p HEXBYTE Pattern to use for payload
</PRE>
<DT id="147"><B>pivot_root</B><DD>
pivot_root <FONT SIZE="-1">NEW_ROOT PUT_OLD</FONT>
<P>
Move the current root file system to <FONT SIZE="-1">PUT_OLD</FONT> and make <FONT SIZE="-1">NEW_ROOT</FONT>
the new root file system
<DT id="148"><B>poweroff</B><DD>
poweroff [-d <FONT SIZE="-1">DELAY</FONT>] [-n] [-f]
<P>
Halt and shut off power
<P>
<PRE>
-d SEC Delay interval
-n Do not sync
-f Force (don't go through init)
</PRE>
<DT id="149"><B>printf</B><DD>
printf <FONT SIZE="-1">FORMAT</FONT> [<FONT SIZE="-1">ARG</FONT>]...
<P>
Format and print <FONT SIZE="-1">ARG</FONT>(s) according to <FONT SIZE="-1">FORMAT</FONT> (a-la C printf)
<DT id="150"><B>ps</B><DD>
ps [-o <FONT SIZE="-1">COL1</FONT>,COL2=HEADER] [-T]
<P>
Show list of processes
<P>
<PRE>
-o COL1,COL2=HEADER Select columns for display
-T Show threads
</PRE>
<DT id="151"><B>pwd</B><DD>
pwd
<P>
Print the full filename of the current working directory
<DT id="152"><B>rdate</B><DD>
rdate [-s/-p] <FONT SIZE="-1">HOST</FONT>
<P>
Set and print time from <FONT SIZE="-1">HOST</FONT> using <FONT SIZE="-1">RFC 868</FONT>
<P>
<PRE>
-s Only set system time
-p Only print time
</PRE>
<DT id="153"><B>readlink</B><DD>
readlink [-fnv] <FONT SIZE="-1">FILE</FONT>
<P>
Display the value of a symlink
<P>
<PRE>
-f Canonicalize by following all symlinks
-n Don't add newline
-v Verbose
</PRE>
<DT id="154"><B>realpath</B><DD>
realpath <FONT SIZE="-1">FILE...</FONT>
<P>
Return the absolute pathnames of given <FONT SIZE="-1">FILE</FONT>
<DT id="155"><B>reboot</B><DD>
reboot [-d <FONT SIZE="-1">DELAY</FONT>] [-n] [-f]
<P>
Reboot the system
<P>
<PRE>
-d SEC Delay interval
-n Do not sync
-f Force (don't go through init)
</PRE>
<DT id="156"><B>renice</B><DD>
renice [-n] <FONT SIZE="-1">PRIORITY</FONT> [[-p | -g | -u] <FONT SIZE="-1">ID...</FONT>]...
<P>
Change scheduling priority of a running process
<P>
<PRE>
-n Add PRIORITY to current nice value
Without -n, nice value is set to PRIORITY
-p Process ids (default)
-g Process group ids
-u Process user names
</PRE>
<DT id="157"><B>reset</B><DD>
reset
<P>
Reset the screen
<DT id="158"><B>resume</B><DD>
resume <FONT SIZE="-1">BLOCKDEV</FONT> [<FONT SIZE="-1">OFFSET</FONT>]
<P>
Restore system state from 'suspend-to-disk' data in <FONT SIZE="-1">BLOCKDEV</FONT>
<DT id="159"><B>rev</B><DD>
rev [<FONT SIZE="-1">FILE</FONT>]...
<P>
Reverse lines of <FONT SIZE="-1">FILE</FONT>
<DT id="160"><B>rm</B><DD>
rm [-irf] <FONT SIZE="-1">FILE...</FONT>
<P>
Remove (unlink) FILEs
<P>
<PRE>
-i Always prompt before removing
-f Never prompt
-R,-r Recurse
</PRE>
<DT id="161"><B>rmdir</B><DD>
rmdir [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">DIRECTORY...</FONT>
<P>
Remove <FONT SIZE="-1">DIRECTORY</FONT> if it is empty
<P>
<PRE>
-p Include parents
--ignore-fail-on-non-empty
</PRE>
<DT id="162"><B>rmmod</B><DD>
rmmod [-wfa] [<FONT SIZE="-1">MODULE</FONT>]...
<P>
Unload kernel modules
<P>
<PRE>
-w Wait until the module is no longer used
-f Force unload
-a Remove all unused modules (recursively)
</PRE>
<DT id="163"><B>route</B><DD>
route [{add|del|delete}]
<P>
Edit kernel routing tables
<P>
<PRE>
-n Don't resolve names
-e Display other/more information
-A inet{6} Select address family
</PRE>
<DT id="164"><B>rpm</B><DD>
rpm -i <FONT SIZE="-1">PACKAGE</FONT>.rpm; rpm -qp[ildc] <FONT SIZE="-1">PACKAGE</FONT>.rpm
<P>
Manipulate <FONT SIZE="-1">RPM</FONT> packages
<P>
Commands:
<P>
<PRE>
-i Install package
-qp Query package
-qpi Show information
-qpl List contents
-qpd List documents
-qpc List config files
</PRE>
<DT id="165"><B>rpm2cpio</B><DD>
rpm2cpio <FONT SIZE="-1">PACKAGE</FONT>.rpm
<P>
Output a cpio archive of the rpm file
<DT id="166"><B>run-init</B><DD>
run-init [-d <FONT SIZE="-1">CAP,CAP...</FONT>] [-n] [-c <FONT SIZE="-1">CONSOLE_DEV</FONT>] <FONT SIZE="-1">NEW_ROOT NEW_INIT</FONT> [<FONT SIZE="-1">ARGS</FONT>]
<P>
Free initramfs and switch to another root fs:
<P>
chroot to <FONT SIZE="-1">NEW_ROOT,</FONT> delete all in /, move <FONT SIZE="-1">NEW_ROOT</FONT> to /,
execute <FONT SIZE="-1">NEW_INIT. PID</FONT> must be 1. <FONT SIZE="-1">NEW_ROOT</FONT> must be a mountpoint.
<P>
<PRE>
-c DEV Reopen stdio to DEV after switch
-d CAPS Drop capabilities
-n Dry run
</PRE>
<DT id="167"><B>run-parts</B><DD>
run-parts [-a <FONT SIZE="-1">ARG</FONT>]... [-u <FONT SIZE="-1">UMASK</FONT>] [--reverse] [--test] [--exit-on-error] <FONT SIZE="-1">DIRECTORY</FONT>
<P>
Run a bunch of scripts in <FONT SIZE="-1">DIRECTORY</FONT>
<P>
<PRE>
-a ARG Pass ARG as argument to scripts
-u UMASK Set UMASK before running scripts
--reverse Reverse execution order
--test Dry run
--exit-on-error Exit if a script exits with non-zero
</PRE>
<DT id="168"><B>sed</B><DD>
sed [-i[<FONT SIZE="-1">SFX</FONT>]] [-nrE] [-f <FONT SIZE="-1">FILE</FONT>]... [-e <FONT SIZE="-1">CMD</FONT>]... [<FONT SIZE="-1">FILE</FONT>]...
or: sed [-i[<FONT SIZE="-1">SFX</FONT>]] [-nrE] <FONT SIZE="-1">CMD</FONT> [<FONT SIZE="-1">FILE</FONT>]...
<P>
<PRE>
-e CMD Add CMD to sed commands to be executed
-f FILE Add FILE contents to sed commands to be executed
-i[SFX] Edit files in-place (otherwise sends to stdout)
Optionally back files up, appending SFX
-n Suppress automatic printing of pattern space
-r,-E Use extended regex syntax
</PRE>
<P>
If no -e or -f, the first non-option argument is the sed command string.
Remaining arguments are input files (stdin if none).
<DT id="169"><B>seq</B><DD>
seq [-w] [-s <FONT SIZE="-1">SEP</FONT>] [<FONT SIZE="-1">FIRST</FONT> [<FONT SIZE="-1">INC</FONT>]] <FONT SIZE="-1">LAST</FONT>
<P>
Print numbers from <FONT SIZE="-1">FIRST</FONT> to <FONT SIZE="-1">LAST,</FONT> in steps of <FONT SIZE="-1">INC.
FIRST, INC</FONT> default to 1.
<P>
<PRE>
-w Pad to last with leading zeros
-s SEP String separator
</PRE>
<DT id="170"><B>setkeycodes</B><DD>
setkeycodes { <FONT SIZE="-1">SCANCODE KEYCODE</FONT> }...
<P>
Modify kernel's scancode-to-keycode map,
allowing unusual keyboards to generate usable keycodes.
<P>
<FONT SIZE="-1">SCANCODE</FONT> is either xx or e0xx (hexadecimal), <FONT SIZE="-1">KEYCODE</FONT> is decimal.
<DT id="171"><B>setpriv</B><DD>
setpriv [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">PROG</FONT> [<FONT SIZE="-1">ARGS</FONT>]
<P>
Run <FONT SIZE="-1">PROG</FONT> with different privilege settings
<P>
-d,--dump<TT>&nbsp;&nbsp;&nbsp;&nbsp;</TT><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>Show current capabilities<BR>
--nnp,--no-new-privs<TT>&nbsp;&nbsp;&nbsp;&nbsp;</TT>Ignore setuid/setgid bits and file capabilities<BR>
--inh-caps <FONT SIZE="-1">CAP,CAP</FONT><TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>Set inheritable capabilities<BR>
--ambient-caps <FONT SIZE="-1">CAP,CAP</FONT><TT>&nbsp;&nbsp;</TT>Set ambient capabilities<BR>
<DT id="172"><B>setsid</B><DD>
setsid [-c] <FONT SIZE="-1">PROG ARGS</FONT>
<P>
Run <FONT SIZE="-1">PROG</FONT> in a new session. <FONT SIZE="-1">PROG</FONT> will have no controlling terminal
and will not be affected by keyboard signals (^C etc).
<P>
<PRE>
-c Set controlling terminal to stdin
</PRE>
<DT id="173"><B>sh</B><DD>
sh [-/+OPTIONS] [-/+o <FONT SIZE="-1">OPT</FONT>]... [-c '<FONT SIZE="-1">SCRIPT</FONT>' [<FONT SIZE="-1">ARG0</FONT> [<FONT SIZE="-1">ARGS</FONT>]] / <FONT SIZE="-1">FILE</FONT> [<FONT SIZE="-1">ARGS</FONT>] / -s [<FONT SIZE="-1">ARGS</FONT>]]
<P>
Unix shell interpreter
<DT id="174"><B>sha1sum</B><DD>
sha1sum [-c[sw]] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print or check <FONT SIZE="-1">SHA1</FONT> checksums
<P>
<PRE>
-c Check sums against list in FILEs
-s Don't output anything, status code shows success
-w Warn about improperly formatted checksum lines
</PRE>
<DT id="175"><B>sha256sum</B><DD>
sha256sum [-c[sw]] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print or check <FONT SIZE="-1">SHA256</FONT> checksums
<P>
<PRE>
-c Check sums against list in FILEs
-s Don't output anything, status code shows success
-w Warn about improperly formatted checksum lines
</PRE>
<DT id="176"><B>sha512sum</B><DD>
sha512sum [-c[sw]] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print or check <FONT SIZE="-1">SHA512</FONT> checksums
<P>
<PRE>
-c Check sums against list in FILEs
-s Don't output anything, status code shows success
-w Warn about improperly formatted checksum lines
</PRE>
<DT id="177"><B>shred</B><DD>
shred <FONT SIZE="-1">FILE...</FONT>
<P>
Overwrite/delete FILEs
<P>
<PRE>
-f Chmod to ensure writability
-n N Overwrite N times (default 3)
-z Final overwrite with zeros
-u Remove file
</PRE>
<DT id="178"><B>shuf</B><DD>
shuf [-e|-i L-H] [-n <FONT SIZE="-1">NUM</FONT>] [-o <FONT SIZE="-1">FILE</FONT>] [-z] [FILE|ARG...]
<P>
Randomly permute lines
<P>
<PRE>
-e Treat ARGs as lines
-i L-H Treat numbers L-H as lines
-n NUM Output at most NUM lines
-o FILE Write to FILE, not standard output
-z End lines with zero byte, not newline
</PRE>
<DT id="179"><B>sleep</B><DD>
sleep [N]...
<P>
Pause for a time equal to the total of the args given, where each arg can
have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays
<DT id="180"><B>sort</B><DD>
sort [-nrugMcszbdfiokt] [-o <FONT SIZE="-1">FILE</FONT>] [-k start[.offset][opts][,end[.offset][opts]] [-t <FONT SIZE="-1">CHAR</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Sort lines of text
<P>
<PRE>
-o FILE Output to FILE
-c Check whether input is sorted
-b Ignore leading blanks
-f Ignore case
-i Ignore unprintable characters
-d Dictionary order (blank or alphanumeric only)
-n Sort numbers
-g General numerical sort
-M Sort month
-V Sort version
-t CHAR Field separator
-k N[,M] Sort by Nth field
-r Reverse sort order
-s Stable (don't sort ties alphabetically)
-u Suppress duplicate lines
-z Lines are terminated by NUL, not newline
</PRE>
<DT id="181"><B>ssl_client</B><DD>
ssl_client [-e] -s <FONT SIZE="-1">FD</FONT> [-r <FONT SIZE="-1">FD</FONT>] [-n <FONT SIZE="-1">SNI</FONT>]
<DT id="182"><B>start-stop-daemon</B><DD>
start-stop-daemon [<FONT SIZE="-1">OPTIONS</FONT>] [-S|-K] ... [-- <FONT SIZE="-1">ARGS...</FONT>]
<P>
Search for matching processes, and then
-K: stop all matching processes
-S: start a process unless a matching process is found
<P>
Process matching:
<P>
<PRE>
-u USERNAME|UID Match only this user's processes
-n NAME Match processes with NAME
in comm field in /proc/PID/stat
-x EXECUTABLE Match processes with this command
command in /proc/PID/cmdline
-p FILE Match a process with PID from FILE
All specified conditions must match
-S only:
-x EXECUTABLE Program to run
-a NAME Zeroth argument
-b Background
-N N Change nice level
-c USER[:[GRP]] Change user/group
-m Write PID to pidfile specified by -p
-K only:
-s SIG Signal to send
-t Match only, exit with 0 if found
Other:
-o Exit with status 0 if nothing is done
-v Verbose
-q Quiet
</PRE>
<DT id="183"><B>stat</B><DD>
stat [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">FILE...</FONT>
<P>
Display file (default) or filesystem status
<P>
<PRE>
-c FMT Use the specified format
-f Display filesystem status
-L Follow links
-t Terse display
</PRE>
<P>
<FONT SIZE="-1">FMT</FONT> sequences for files:
<P>
<PRE>
%a Access rights in octal
%A Access rights in human readable form
%b Number of blocks allocated (see %B)
%B Size in bytes of each block reported by %b
%d Device number in decimal
%D Device number in hex
%f Raw mode in hex
%F File type
%g Group ID
%G Group name
%h Number of hard links
%i Inode number
%n File name
%N File name, with -&gt; TARGET if symlink
%o I/O block size
%s Total size in bytes
%t Major device type in hex
%T Minor device type in hex
%u User ID
%U User name
%x Time of last access
%X Time of last access as seconds since Epoch
%y Time of last modification
%Y Time of last modification as seconds since Epoch
%z Time of last change
%Z Time of last change as seconds since Epoch
</PRE>
<P>
<FONT SIZE="-1">FMT</FONT> sequences for file systems:
<P>
<PRE>
%a Free blocks available to non-superuser
%b Total data blocks
%c Total file nodes
%d Free file nodes
%f Free blocks
%i File System ID in hex
%l Maximum length of filenames
%n File name
%s Block size (for faster transfer)
%S Fundamental block size (for block counts)
%t Type in hex
%T Type in human readable form
</PRE>
<DT id="184"><B>strings</B><DD>
strings [-fo] [-t o/d/x] [-n <FONT SIZE="-1">LEN</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Display printable strings in a binary file
<P>
<PRE>
-f Precede strings with filenames
-o Precede strings with octal offsets
-t o/d/x Precede strings with offsets in base 8/10/16
-n LEN At least LEN characters form a string (default 4)
</PRE>
<DT id="185"><B>stty</B><DD>
stty [-a|g] [-F <FONT SIZE="-1">DEVICE</FONT>] [<FONT SIZE="-1">SETTING</FONT>]...
<P>
Without arguments, prints baud rate, line discipline,
and deviations from stty sane
<P>
<PRE>
-F DEVICE Open device instead of stdin
-a Print all current settings in human-readable form
-g Print in stty-readable form
[SETTING] See manpage
</PRE>
<DT id="186"><B>su</B><DD>
su [-lmp] [-] [-s <FONT SIZE="-1">SH</FONT>] [<FONT SIZE="-1">USER</FONT> [<FONT SIZE="-1">SCRIPT ARGS /</FONT> -c '<FONT SIZE="-1">CMD</FONT>' <FONT SIZE="-1">ARG0 ARGS</FONT>]]
<P>
Run shell under <FONT SIZE="-1">USER</FONT> (by default, root)
<P>
<PRE>
-,-l Clear environment, go to home dir, run shell as login shell
-p,-m Do not set new $HOME, $SHELL, $USER, $LOGNAME
-c CMD Command to pass to 'sh -c'
-s SH Shell to use instead of user's default
</PRE>
<DT id="187"><B>sulogin</B><DD>
sulogin [-t N] [<FONT SIZE="-1">TTY</FONT>]
<P>
Single user login
<P>
<PRE>
-t N Timeout
</PRE>
<DT id="188"><B>svc</B><DD>
svc [-udopchaitkx] <FONT SIZE="-1">SERVICE_DIR...</FONT>
<P>
Control services monitored by runsv supervisor
<P>
<PRE>
-u If service is not running, start it; restart if it stops
-d If service is running, send TERM+CONT signals; do not restart it
-o Once: if service is not running, start it; do not restart it
-pchaitk Send STOP, CONT, HUP, ALRM, INT, TERM, KILL signal to service
-x Exit: runsv will exit as soon as the service is down
</PRE>
<DT id="189"><B>svok</B><DD>
svok <FONT SIZE="-1">SERVICE_DIR</FONT>
<P>
Check whether runsv supervisor is running.
Exit code is 0 if it does, 100 if it does not,
111 (with error message) if <FONT SIZE="-1">SERVICE_DIR</FONT> does not exist.
<DT id="190"><B>swapoff</B><DD>
swapoff [-a] [<FONT SIZE="-1">DEVICE</FONT>]
<P>
Stop swapping on <FONT SIZE="-1">DEVICE</FONT>
<P>
<PRE>
-a Stop swapping on all swap devices
</PRE>
<DT id="191"><B>swapon</B><DD>
swapon [-a] [-e] [-d[<FONT SIZE="-1">POL</FONT>]] [<FONT SIZE="-1">DEVICE</FONT>]
<P>
Start swapping on <FONT SIZE="-1">DEVICE</FONT>
<P>
<PRE>
-a Start swapping on all swap devices
-d[POL] Discard blocks at swapon (POL=once),
as freed (POL=pages), or both (POL omitted)
-e Silently skip devices that do not exist
</PRE>
<DT id="192"><B>switch_root</B><DD>
switch_root [-c <FONT SIZE="-1">CONSOLE_DEV</FONT>] <FONT SIZE="-1">NEW_ROOT NEW_INIT</FONT> [<FONT SIZE="-1">ARGS</FONT>]
<P>
Free initramfs and switch to another root fs:
<P>
chroot to <FONT SIZE="-1">NEW_ROOT,</FONT> delete all in /, move <FONT SIZE="-1">NEW_ROOT</FONT> to /,
execute <FONT SIZE="-1">NEW_INIT. PID</FONT> must be 1. <FONT SIZE="-1">NEW_ROOT</FONT> must be a mountpoint.
<P>
<PRE>
-c DEV Reopen stdio to DEV after switch
</PRE>
<DT id="193"><B>sync</B><DD>
sync [-df] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Write all buffered blocks (in FILEs) to disk
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>-d<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>Avoid syncing metadata<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>-f<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>Sync filesystems underlying FILEs<BR>
<DT id="194"><B>sysctl</B><DD>
sysctl -p [-enq] [<FONT SIZE="-1">FILE...</FONT>] / [-enqaw] [KEY[=VALUE]]...
<P>
Show/set kernel parameters
<P>
<PRE>
-p Set values from FILEs (default /etc/sysctl.conf)
-e Don't warn about unknown keys
-n Don't show key names
-q Quiet
-a Show all values
-w Set values
</PRE>
<DT id="195"><B>syslogd</B><DD>
syslogd [<FONT SIZE="-1">OPTIONS</FONT>]
<P>
System logging utility
(this version of syslogd ignores /etc/syslog.conf)
<P>
<PRE>
-n Run in foreground
-R HOST[:PORT] Log to HOST:PORT (default PORT:514)
-L Log locally and via network (default is network only if -R)
-C[size_kb] Log to shared mem buffer (use logread to read it)
-O FILE Log to FILE (default: /var/log/messages, stdout if -)
-l N Log only messages more urgent than prio N (1-8)
-S Smaller output
-t Strip client-generated timestamps
</PRE>
<DT id="196"><B>tac</B><DD>
tac [<FONT SIZE="-1">FILE</FONT>]...
<P>
Concatenate FILEs and print them in reverse
<DT id="197"><B>tail</B><DD>
tail [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Print last 10 lines of each <FONT SIZE="-1">FILE</FONT> (or stdin) to stdout.
With more than one <FONT SIZE="-1">FILE,</FONT> precede each with a filename header.
<P>
<PRE>
-f Print data as file grows
-c [+]N[kbm] Print last N bytes
-n N[kbm] Print last N lines
-n +N[kbm] Start on Nth line and print the rest
-q Never print headers
-s SECONDS Wait SECONDS between reads with -f
-v Always print headers
-F Same as -f, but keep retrying
</PRE>
<P>
N may be suffixed by k (x1024), b (x512), or m (x1024^2).
<DT id="198"><B>tar</B><DD>
tar c|x|t [-ZzJjahmvokO] [-f <FONT SIZE="-1">TARFILE</FONT>] [-C <FONT SIZE="-1">DIR</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Create, extract, or list files from a tar file
<P>
<PRE>
c Create
x Extract
t List
-f FILE Name of TARFILE ('-' for stdin/out)
-C DIR Change to DIR before operation
-v Verbose
-O Extract to stdout
-m Don't restore mtime
-o Don't restore user:group
-k Don't replace existing files
-Z (De)compress using compress
-z (De)compress using gzip
-J (De)compress using xz
-j (De)compress using bzip2
-a (De)compress using lzma
-h Follow symlinks
</PRE>
<DT id="199"><B>taskset</B><DD>
taskset [-p] [<FONT SIZE="-1">HEXMASK</FONT>] <FONT SIZE="-1">PID</FONT> | <FONT SIZE="-1">PROG ARGS</FONT>
<P>
Set or get <FONT SIZE="-1">CPU</FONT> affinity
<P>
<PRE>
-p Operate on an existing PID
</PRE>
<DT id="200"><B>tc</B><DD>
tc <FONT SIZE="-1">OBJECT CMD</FONT> [dev <FONT SIZE="-1">STRING</FONT>]
<P>
<FONT SIZE="-1">OBJECT:</FONT> qdisc|class|filter
<FONT SIZE="-1">CMD:</FONT> add|del|change|replace|show
<P>
qdisc [handle <FONT SIZE="-1">QHANDLE</FONT>] [root|ingress|parent <FONT SIZE="-1">CLASSID</FONT>]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[[<FONT SIZE="-1">QDISC_KIND</FONT>] [help|OPTIONS]]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT><FONT SIZE="-1">QDISC_KIND</FONT> := [p|b]fifo|tbf|prio|cbq|red|etc.<BR>
qdisc show [dev <FONT SIZE="-1">STRING</FONT>] [ingress]
class [classid <FONT SIZE="-1">CLASSID</FONT>] [root|parent <FONT SIZE="-1">CLASSID</FONT>]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[[<FONT SIZE="-1">QDISC_KIND</FONT>] [help|OPTIONS] ]<BR>
class show [ dev <FONT SIZE="-1">STRING</FONT> ] [root|parent <FONT SIZE="-1">CLASSID</FONT>]
filter [pref <FONT SIZE="-1">PRIO</FONT>] [protocol <FONT SIZE="-1">PROTO</FONT>]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[root|classid <FONT SIZE="-1">CLASSID</FONT>] [handle <FONT SIZE="-1">FILTERID</FONT>]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[[<FONT SIZE="-1">FILTER_TYPE</FONT>] [help|OPTIONS]]<BR>
filter show [dev <FONT SIZE="-1">STRING</FONT>] [root|parent <FONT SIZE="-1">CLASSID</FONT>]
<DT id="201"><B>tee</B><DD>
tee [-ai] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Copy stdin to each <FONT SIZE="-1">FILE,</FONT> and also to stdout
<P>
<PRE>
-a Append to the given FILEs, don't overwrite
-i Ignore interrupt signals (SIGINT)
</PRE>
<DT id="202"><B>telnet</B><DD>
telnet [-a] [-l <FONT SIZE="-1">USER</FONT>] <FONT SIZE="-1">HOST</FONT> [<FONT SIZE="-1">PORT</FONT>]
<P>
Connect to telnet server
<P>
<PRE>
-a Automatic login with $USER variable
-l USER Automatic login as USER
</PRE>
<DT id="203"><B>telnetd</B><DD>
telnetd [<FONT SIZE="-1">OPTIONS</FONT>]
<P>
Handle incoming telnet connections
<P>
<PRE>
-l LOGIN Exec LOGIN on connect
-f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue
-K Close connection as soon as login exits
(normally wait until all programs close slave pty)
-p PORT Port to listen on
-b ADDR[:PORT] Address to bind to
-F Run in foreground
-i Inetd mode
</PRE>
<DT id="204"><B>tftp</B><DD>
tftp [<FONT SIZE="-1">OPTIONS</FONT>] <FONT SIZE="-1">HOST</FONT> [<FONT SIZE="-1">PORT</FONT>]
<P>
Transfer a file from/to tftp server
<P>
<PRE>
-l FILE Local FILE
-r FILE Remote FILE
-g Get file
-p Put file
-b SIZE Transfer blocks of SIZE octets
</PRE>
<DT id="205"><B>time</B><DD>
time [-vpa] [-o <FONT SIZE="-1">FILE</FONT>] <FONT SIZE="-1">PROG ARGS</FONT>
<P>
Run <FONT SIZE="-1">PROG,</FONT> display resource usage when it exits
<P>
<PRE>
-v Verbose
-p POSIX output format
-f FMT Custom format
-o FILE Write result to FILE
-a Append (else overwrite)
</PRE>
<DT id="206"><B>timeout</B><DD>
timeout [-s <FONT SIZE="-1">SIG</FONT>] <FONT SIZE="-1">SECS PROG ARGS</FONT>
<P>
Runs <FONT SIZE="-1">PROG.</FONT> Sends <FONT SIZE="-1">SIG</FONT> to it if it is not gone in <FONT SIZE="-1">SECS</FONT> seconds.
Default <FONT SIZE="-1">SIG: TERM.</FONT>
<DT id="207"><B>top</B><DD>
top [-b] [-nCOUNT] [-dSECONDS]
<P>
Provide a view of process activity in real time.
Read the status of all processes from /proc each <FONT SIZE="-1">SECONDS</FONT>
and display a screenful of them.
Keys:
<P>
<PRE>
N/M/P/T: sort by pid/mem/cpu/time
R: reverse sort
H: toggle threads
Q,^C: exit
</PRE>
<P>
Options:
<P>
<PRE>
-b Batch mode
-n N Exit after N iterations
-d N Delay between updates
</PRE>
<DT id="208"><B>touch</B><DD>
touch [-c] [-d <FONT SIZE="-1">DATE</FONT>] [-t <FONT SIZE="-1">DATE</FONT>] [-r <FONT SIZE="-1">FILE</FONT>] <FONT SIZE="-1">FILE...</FONT>
<P>
Update the last-modified date on the given FILE[s]
<P>
<PRE>
-c Don't create files
-h Don't follow links
-d DT Date/time to use
-t DT Date/time to use
-r FILE Use FILE's date/time
</PRE>
<DT id="209"><B>tr</B><DD>
tr [-cds] <FONT SIZE="-1">STRING1</FONT> [<FONT SIZE="-1">STRING2</FONT>]
<P>
Translate, squeeze, or delete characters from stdin, writing to stdout
<P>
<PRE>
-c Take complement of STRING1
-d Delete input characters coded STRING1
-s Squeeze multiple output characters of STRING2 into one character
</PRE>
<DT id="210"><B>traceroute</B><DD>
traceroute [-46FIlnrv] [-f 1ST_TTL] [-m <FONT SIZE="-1">MAXTTL</FONT>] [-q <FONT SIZE="-1">PROBES</FONT>] [-p <FONT SIZE="-1">PORT</FONT>]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-t <FONT SIZE="-1">TOS</FONT>] [-w <FONT SIZE="-1">WAIT_SEC</FONT>] [-s <FONT SIZE="-1">SRC_IP</FONT>] [-i <FONT SIZE="-1">IFACE</FONT>]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-z <FONT SIZE="-1">PAUSE_MSEC</FONT>] <FONT SIZE="-1">HOST</FONT> [<FONT SIZE="-1">BYTES</FONT>]<BR>
<P>
Trace the route to <FONT SIZE="-1">HOST</FONT>
<P>
<PRE>
-4,-6 Force IP or IPv6 name resolution
-F Set don't fragment bit
-l Display TTL value of the returned packet
-n Print numeric addresses
-r Bypass routing tables, send directly to HOST
-v Verbose
-f N First number of hops (default 1)
-m N Max number of hops
-q N Number of probes per hop (default 3)
-p N Base UDP port number used in probes
(default 33434)
-s IP Source address
-i IFACE Source interface
-t N Type-of-service in probe packets (default 0)
-w SEC Time to wait for a response (default 3)
-g IP Loose source route gateway (8 max)
</PRE>
<DT id="211"><B>traceroute6</B><DD>
traceroute6 [-nrv] [-m <FONT SIZE="-1">MAXTTL</FONT>] [-q <FONT SIZE="-1">PROBES</FONT>] [-p <FONT SIZE="-1">PORT</FONT>]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-t <FONT SIZE="-1">TOS</FONT>] [-w <FONT SIZE="-1">WAIT_SEC</FONT>] [-s <FONT SIZE="-1">SRC_IP</FONT>] [-i <FONT SIZE="-1">IFACE</FONT>]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT><FONT SIZE="-1">HOST</FONT> [<FONT SIZE="-1">BYTES</FONT>]<BR>
<P>
Trace the route to <FONT SIZE="-1">HOST</FONT>
<P>
<PRE>
-n Print numeric addresses
-r Bypass routing tables, send directly to HOST
-v Verbose
-m N Max number of hops
-q N Number of probes per hop (default 3)
-p N Base UDP port number used in probes
(default 33434)
-s IP Source address
-i IFACE Source interface
-t N Type-of-service in probe packets (default 0)
-w SEC Time wait for a response (default 3)
</PRE>
<DT id="212"><B>truncate</B><DD>
truncate [-c] -s <FONT SIZE="-1">SIZE FILE...</FONT>
<P>
Truncate FILEs to the given size
<P>
<PRE>
-c Do not create files
-s SIZE Truncate to SIZE
</PRE>
<DT id="213"><B>tty</B><DD>
tty
<P>
Print file name of stdin's terminal
<P>
<PRE>
-s Print nothing, only return exit status
</PRE>
<DT id="214"><B>tunctl</B><DD>
tunctl [-f device] ([-t name] | -d name)
<P>
Create or delete tun interfaces
<P>
<PRE>
-f name tun device (/dev/net/tun)
-t name Create iface 'name'
-d name Delete iface 'name'
</PRE>
<DT id="215"><B>ubirename</B><DD>
ubirename <FONT SIZE="-1">UBI_DEVICE OLD_VOLNAME NEW_VOLNAME</FONT> [<FONT SIZE="-1">OLD2 NEW2</FONT>]...
<P>
Rename <FONT SIZE="-1">UBI</FONT> volumes on <FONT SIZE="-1">UBI_DEVICE</FONT>
<DT id="216"><B>udhcpc</B><DD>
udhcpc [-fbqRB] [-a[<FONT SIZE="-1">MSEC</FONT>]] [-t N] [-T <FONT SIZE="-1">SEC</FONT>] [-A SEC/-n]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-i <FONT SIZE="-1">IFACE</FONT>] [-s <FONT SIZE="-1">PROG</FONT>] [-p <FONT SIZE="-1">PIDFILE</FONT>]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-oC] [-r <FONT SIZE="-1">IP</FONT>] [-V <FONT SIZE="-1">VENDOR</FONT>] [-F <FONT SIZE="-1">NAME</FONT>] [-x <FONT SIZE="-1">OPT:VAL</FONT>]... [-O <FONT SIZE="-1">OPT</FONT>]...<BR>
<P>
<PRE>
-i IFACE Interface to use (default eth0)
-s PROG Run PROG at DHCP events (default /etc/udhcpc/default.script)
-p FILE Create pidfile
-B Request broadcast replies
-t N Send up to N discover packets (default 3)
-T SEC Pause between packets (default 3)
-A SEC Wait if lease is not obtained (default 20)
-n Exit if lease is not obtained
-q Exit after obtaining lease
-R Release IP on exit
-f Run in foreground
-b Background if lease is not obtained
-S Log to syslog too
-a[MSEC] Validate offered address with ARP ping
-r IP Request this IP address
-o Don't request any options (unless -O is given)
-O OPT Request option OPT from server (cumulative)
-x OPT:VAL Include option OPT in sent packets (cumulative)
Examples of string, numeric, and hex byte opts:
-x hostname:bbox - option 12
-x lease:3600 - option 51 (lease time)
-x 0x3d:0100BEEFC0FFEE - option 61 (client id)
-x 14:'&quot;dumpfile&quot;' - option 14 (shell-quoted)
-F NAME Ask server to update DNS mapping for NAME
-V VENDOR Vendor identifier (default 'udhcp VERSION')
-C Don't send MAC as client identifier
Signals:
USR1 Renew lease
USR2 Release lease
</PRE>
<DT id="217"><B>udhcpd</B><DD>
udhcpd [-fS] [-I <FONT SIZE="-1">ADDR</FONT>] [<FONT SIZE="-1">CONFFILE</FONT>]
<P>
<FONT SIZE="-1">DHCP</FONT> server
<P>
<PRE>
-f Run in foreground
-S Log to syslog too
-I ADDR Local address
-a MSEC Timeout for ARP ping (default 2000)
</PRE>
<DT id="218"><B>uevent</B><DD>
uevent [<FONT SIZE="-1">PROG</FONT> [<FONT SIZE="-1">ARGS</FONT>]]
<P>
uevent runs <FONT SIZE="-1">PROG</FONT> for every netlink notification.
<FONT SIZE="-1">PROG</FONT>'s environment contains data passed from the kernel.
Typical usage (daemon for dynamic device node creation):
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT># uevent mdev &amp; mdev -s<BR>
<DT id="219"><B>umount</B><DD>
umount [<FONT SIZE="-1">OPTIONS</FONT>] FILESYSTEM|DIRECTORY
<P>
Unmount file systems
<P>
<PRE>
-a Unmount all file systems
-r Try to remount devices as read-only if mount is busy
-l Lazy umount (detach filesystem)
-f Force umount (i.e., unreachable NFS server)
-d Free loop device if it has been used
-t FSTYPE[,...] Unmount only these filesystem type(s)
</PRE>
<DT id="220"><B>uname</B><DD>
uname [-amnrspvio]
<P>
Print system information
<P>
<PRE>
-a Print all
-m The machine (hardware) type
-n Hostname
-r Kernel release
-s Kernel name (default)
-p Processor type
-v Kernel version
-i The hardware platform
-o OS name
</PRE>
<DT id="221"><B>uncompress</B><DD>
uncompress [-cf] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress .Z file[s]
<P>
<PRE>
-c Write to stdout
-f Overwrite
</PRE>
<DT id="222"><B>unexpand</B><DD>
unexpand [-fa][-t N] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Convert spaces to tabs, writing to stdout
<P>
<PRE>
-a Convert all blanks
-f Convert only leading blanks
-t N Tabstops every N chars
</PRE>
<DT id="223"><B>uniq</B><DD>
uniq [-cdu][-f,s,w N] [<FONT SIZE="-1">INPUT</FONT> [<FONT SIZE="-1">OUTPUT</FONT>]]
<P>
Discard duplicate lines
<P>
<PRE>
-c Prefix lines by the number of occurrences
-d Only print duplicate lines
-u Only print unique lines
-i Ignore case
-f N Skip first N fields
-s N Skip first N chars (after any skipped fields)
-w N Compare N characters in line
</PRE>
<DT id="224"><B>unix2dos</B><DD>
unix2dos [-ud] [<FONT SIZE="-1">FILE</FONT>]
<P>
Convert <FONT SIZE="-1">FILE</FONT> in-place from Unix to <FONT SIZE="-1">DOS</FONT> format.
When no file is given, use stdin/stdout.
<P>
<PRE>
-u dos2unix
-d unix2dos
</PRE>
<DT id="225"><B>unlink</B><DD>
unlink <FONT SIZE="-1">FILE</FONT>
<P>
Delete <FONT SIZE="-1">FILE</FONT> by calling <B>unlink()</B>
<DT id="226"><B>unlzma</B><DD>
unlzma [-cfk] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress <FONT SIZE="-1">FILE</FONT> (or stdin)
<P>
<PRE>
-c Write to stdout
-f Force
-k Keep input files
</PRE>
<DT id="227"><B>unshare</B><DD>
unshare [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">PROG</FONT> [<FONT SIZE="-1">ARGS</FONT>]]
<P>
<PRE>
-m,--mount[=FILE] Unshare mount namespace
-u,--uts[=FILE] Unshare UTS namespace (hostname etc.)
-i,--ipc[=FILE] Unshare System V IPC namespace
-n,--net[=FILE] Unshare network namespace
-p,--pid[=FILE] Unshare PID namespace
-U,--user[=FILE] Unshare user namespace
-f,--fork Fork before execing PROG
-r,--map-root-user Map current user to root (implies -U)
--mount-proc[=DIR] Mount /proc filesystem first (implies -m)
--propagation slave|shared|private|unchanged
Modify mount propagation in mount namespace
--setgroups allow|deny Control the setgroups syscall in user namespaces
</PRE>
<DT id="228"><B>unxz</B><DD>
unxz [-cfk] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress <FONT SIZE="-1">FILE</FONT> (or stdin)
<P>
<PRE>
-c Write to stdout
-f Force
-k Keep input files
</PRE>
<DT id="229"><B>unzip</B><DD>
unzip [-lnojpq] FILE[.zip] [<FONT SIZE="-1">FILE</FONT>]... [-x <FONT SIZE="-1">FILE...</FONT>] [-d <FONT SIZE="-1">DIR</FONT>]
<P>
Extract FILEs from <FONT SIZE="-1">ZIP</FONT> archive
<P>
<PRE>
-l List contents (with -q for short form)
-n Never overwrite files (default: ask)
-o Overwrite
-j Do not restore paths
-p Print to stdout
-q Quiet
-x FILE Exclude FILEs
-d DIR Extract into DIR
</PRE>
<DT id="230"><B>uptime</B><DD>
uptime
<P>
Display the time since the last boot
<DT id="231"><B>usleep</B><DD>
usleep N
<P>
Pause for N microseconds
<DT id="232"><B>uudecode</B><DD>
uudecode [-o <FONT SIZE="-1">OUTFILE</FONT>] [<FONT SIZE="-1">INFILE</FONT>]
<P>
Uudecode a file
Finds <FONT SIZE="-1">OUTFILE</FONT> in uuencoded source unless -o is given
<DT id="233"><B>uuencode</B><DD>
uuencode [-m] [<FONT SIZE="-1">FILE</FONT>] <FONT SIZE="-1">STORED_FILENAME</FONT>
<P>
Uuencode <FONT SIZE="-1">FILE</FONT> (or stdin) to stdout
<P>
<PRE>
-m Use base64 encoding per RFC1521
</PRE>
<DT id="234"><B>vconfig</B><DD>
vconfig <FONT SIZE="-1">COMMAND</FONT> [<FONT SIZE="-1">OPTIONS</FONT>]
<P>
Create and remove virtual ethernet devices
<P>
<PRE>
add IFACE VLAN_ID
rem VLAN_NAME
set_flag IFACE 0|1 VLAN_QOS
set_egress_map VLAN_NAME SKB_PRIO VLAN_QOS
set_ingress_map VLAN_NAME SKB_PRIO VLAN_QOS
set_name_type NAME_TYPE
</PRE>
<DT id="235"><B>vi</B><DD>
vi [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Edit <FONT SIZE="-1">FILE</FONT>
<P>
<PRE>
-c CMD Initial command to run ($EXINIT also available)
-R Read-only
-H List available features
</PRE>
<DT id="236"><B>w</B><DD>
w
<P>
Show who is logged on
<DT id="237"><B>watch</B><DD>
watch [-n <FONT SIZE="-1">SEC</FONT>] [-t] <FONT SIZE="-1">PROG ARGS</FONT>
<P>
Run <FONT SIZE="-1">PROG</FONT> periodically
<P>
<PRE>
-n Loop period in seconds (default 2)
-t Don't print header
</PRE>
<DT id="238"><B>watchdog</B><DD>
watchdog [-t N[ms]] [-T N[ms]] [-F] <FONT SIZE="-1">DEV</FONT>
<P>
Periodically write to watchdog device <FONT SIZE="-1">DEV</FONT>
<P>
<PRE>
-T N Reboot after N seconds if not reset (default 60)
-t N Reset every N seconds (default 30)
-F Run in foreground
</PRE>
<P>
Use 500ms to specify period in milliseconds
<DT id="239"><B>wc</B><DD>
wc [-cmlwL] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Count lines, words, and bytes for each <FONT SIZE="-1">FILE</FONT> (or stdin)
<P>
<PRE>
-c Count bytes
-m Count characters
-l Count newlines
-w Count words
-L Print longest line length
</PRE>
<DT id="240"><B>wget</B><DD>
wget [-c|--continue] [--spider] [-q|--quiet] [-O|--output-document <FONT SIZE="-1">FILE</FONT>]
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[--header 'header: value'] [-Y|--proxy on/off] [-P <FONT SIZE="-1">DIR</FONT>]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[--no-check-certificate]<BR>
<TT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TT>[-S|--server-response] [-U|--user-agent <FONT SIZE="-1">AGENT</FONT>] <FONT SIZE="-1">URL...</FONT><BR>
<P>
Retrieve files via <FONT SIZE="-1">HTTP</FONT> or <FONT SIZE="-1">FTP</FONT>
<P>
<PRE>
--spider Only check URL existence: $? is 0 if exists
--no-check-certificate Don't validate the server's certificate
-c Continue retrieval of aborted transfer
-q Quiet
-P DIR Save to DIR (default .)
-S Show server response
-O FILE Save to FILE ('-' for stdout)
-U STR Use STR for User-Agent header
-Y on/off Use proxy
</PRE>
<DT id="241"><B>which</B><DD>
which [<FONT SIZE="-1">COMMAND</FONT>]...
<P>
Locate a <FONT SIZE="-1">COMMAND</FONT>
<DT id="242"><B>who</B><DD>
who [-a]
<P>
Show who is logged on
<P>
<PRE>
-a Show all
-H Print column headers
</PRE>
<DT id="243"><B>whoami</B><DD>
whoami
<P>
Print the user name associated with the current effective user id
<DT id="244"><B>xargs</B><DD>
xargs [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">PROG ARGS</FONT>]
<P>
Run <FONT SIZE="-1">PROG</FONT> on every item given by stdin
<P>
<PRE>
-p Ask user whether to run each command
-r Don't run command if input is empty
-0 Input is separated by NULs
-a FILE Read from FILE instead of stdin
-t Print the command on stderr before execution
-e[STR] STR stops input processing
-n N Pass no more than N args to PROG
-s N Pass command line of no more than N bytes
-I STR Replace STR within PROG ARGS with input line
-P N Run up to N PROGs in parallel
-x Exit if size is exceeded
</PRE>
<DT id="245"><B>xxd</B><DD>
xxd [<FONT SIZE="-1">OPTIONS</FONT>] [<FONT SIZE="-1">FILE</FONT>]
<P>
Hex dump <FONT SIZE="-1">FILE</FONT> (or stdin)
<P>
<PRE>
-g N Bytes per group
-c N Bytes per line
-p Show only hex bytes, assumes -c30
-l LENGTH Show only first LENGTH bytes
-s OFFSET Skip OFFSET bytes
</PRE>
<DT id="246"><B>xz</B><DD>
xz -d [-cfk] [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress <FONT SIZE="-1">FILE</FONT> (or stdin)
<P>
<PRE>
-d Decompress
-c Write to stdout
-f Force
-k Keep input files
</PRE>
<DT id="247"><B>xzcat</B><DD>
xzcat [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress to stdout
<DT id="248"><B>yes</B><DD>
yes [<FONT SIZE="-1">STRING</FONT>]
<P>
Repeatedly output a line with <FONT SIZE="-1">STRING,</FONT> or 'y'
<DT id="249"><B>zcat</B><DD>
zcat [<FONT SIZE="-1">FILE</FONT>]...
<P>
Decompress to stdout
</DL>
<A NAME="lbAI">&nbsp;</A>
<H2>LIBC NSS</H2>
<FONT SIZE="-1">GNU</FONT> Libc (glibc) uses the Name Service Switch (<FONT SIZE="-1">NSS</FONT>) to configure the behavior
of the C library for the local environment, and to configure how it reads
system data, such as passwords and group information. This is implemented
using an /etc/nsswitch.conf configuration file, and using one or more of the
/lib/libnss_* libraries. BusyBox tries to avoid using any libc calls that make
use of <FONT SIZE="-1">NSS.</FONT> Some applets however, such as login and su, will use libc functions
that require <FONT SIZE="-1">NSS.</FONT>
<P>
If you enable <FONT SIZE="-1">CONFIG_USE_BB_PWD_GRP,</FONT> BusyBox will use internal functions to
directly access the /etc/passwd, /etc/group, and /etc/shadow files without
using <FONT SIZE="-1">NSS.</FONT> This may allow you to run your system without the need for
installing any of the <FONT SIZE="-1">NSS</FONT> configuration files and libraries.
<P>
When used with glibc, the BusyBox 'networking' applets will similarly require
that you install at least some of the glibc <FONT SIZE="-1">NSS</FONT> stuff (in particular,
/etc/nsswitch.conf, /lib/libnss_dns*, /lib/libnss_files*, and /lib/libresolv*).
<P>
Shameless Plug: As an alternative, one could use a C library such as uClibc. In
addition to making your system significantly smaller, uClibc does not require the
use of any <FONT SIZE="-1">NSS</FONT> support files or libraries.
<A NAME="lbAJ">&nbsp;</A>
<H2>MAINTAINER</H2>
Denis Vlasenko &lt;<A HREF="mailto:vda.linux@googlemail.com">vda.linux@googlemail.com</A>&gt;
<A NAME="lbAK">&nbsp;</A>
<H2>AUTHORS</H2>
The following people have contributed code to BusyBox whether they know it or
not. If you have written code included in BusyBox, you should probably be
listed here so you can obtain your bit of eternal glory. If you should be
listed here, or the description of what you have done needs more detail, or is
incorrect, please send in an update.
<P>
Emanuele Aina &lt;<A HREF="mailto:emanuele.aina@tiscali.it">emanuele.aina@tiscali.it</A>&gt;
<BR>&nbsp;&nbsp;&nbsp;&nbsp;run-parts
<P>
Erik Andersen &lt;<A HREF="mailto:andersen@codepoet.org">andersen@codepoet.org</A>&gt;
<P>
<PRE>
Tons of new stuff, major rewrite of most of the
core apps, tons of new apps as noted in header files.
Lots of tedious effort writing these boring docs that
nobody is going to actually read.
</PRE>
<P>
Laurence Anderson &lt;<A HREF="mailto:l.d.anderson@warwick.ac.uk">l.d.anderson@warwick.ac.uk</A>&gt;
<P>
<PRE>
rpm2cpio, unzip, get_header_cpio, read_gz interface, rpm
</PRE>
<P>
Jeff Angielski &lt;<A HREF="mailto:jeff@theptrgroup.com">jeff@theptrgroup.com</A>&gt;
<P>
<PRE>
ftpput, ftpget
</PRE>
<P>
Edward Betts &lt;<A HREF="mailto:edward@debian.org">edward@debian.org</A>&gt;
<P>
<PRE>
expr, hostid, logname, whoami
</PRE>
<P>
John Beppu &lt;<A HREF="mailto:beppu@codepoet.org">beppu@codepoet.org</A>&gt;
<P>
<PRE>
du, nslookup, sort
</PRE>
<P>
Brian Candler &lt;<A HREF="mailto:B.Candler@pobox.com">B.Candler@pobox.com</A>&gt;
<P>
<PRE>
tiny-ls(ls)
</PRE>
<P>
Randolph Chung &lt;<A HREF="mailto:tausq@debian.org">tausq@debian.org</A>&gt;
<P>
<PRE>
fbset, ping, hostname
</PRE>
<P>
Dave Cinege &lt;<A HREF="mailto:dcinege@psychosis.com">dcinege@psychosis.com</A>&gt;
<P>
<PRE>
more(v2), makedevs, dutmp, modularization, auto links file,
various fixes, Linux Router Project maintenance
</PRE>
<P>
Jordan Crouse &lt;<A HREF="mailto:jordan@cosmicpenguin.net">jordan@cosmicpenguin.net</A>&gt;
<P>
<PRE>
ipcalc
</PRE>
<P>
Magnus Damm &lt;<A HREF="mailto:damm@opensource.se">damm@opensource.se</A>&gt;
<P>
<PRE>
tftp client insmod powerpc support
</PRE>
<P>
Larry Doolittle &lt;<A HREF="mailto:ldoolitt@recycle.lbl.gov">ldoolitt@recycle.lbl.gov</A>&gt;
<P>
<PRE>
pristine source directory compilation, lots of patches and fixes.
</PRE>
<P>
Glenn Engel &lt;<A HREF="mailto:glenne@engel.org">glenne@engel.org</A>&gt;
<P>
<PRE>
httpd
</PRE>
<P>
Gennady Feldman &lt;<A HREF="mailto:gfeldman@gena01.com">gfeldman@gena01.com</A>&gt;
<P>
<PRE>
Sysklogd (single threaded syslogd, IPC Circular buffer support,
logread), various fixes.
</PRE>
<P>
Karl M. Hegbloom &lt;<A HREF="mailto:karlheg@debian.org">karlheg@debian.org</A>&gt;
<P>
<PRE>
cp_mv.c, the test suite, various fixes to utility.c, &amp;c.
</PRE>
<P>
Daniel Jacobowitz &lt;<A HREF="mailto:dan@debian.org">dan@debian.org</A>&gt;
<P>
<PRE>
mktemp.c
</PRE>
<P>
Matt Kraai &lt;<A HREF="mailto:kraai@alumni.cmu.edu">kraai@alumni.cmu.edu</A>&gt;
<P>
<PRE>
documentation, bugfixes, test suite
</PRE>
<P>
Stephan Linz &lt;<A HREF="mailto:linz@li-pro.net">linz@li-pro.net</A>&gt;
<P>
<PRE>
ipcalc, Red Hat equivalence
</PRE>
<P>
John Lombardo &lt;<A HREF="mailto:john@deltanet.com">john@deltanet.com</A>&gt;
<P>
<PRE>
tr
</PRE>
<P>
Glenn McGrath &lt;<A HREF="mailto:bug1@iinet.net.au">bug1@iinet.net.au</A>&gt;
<P>
<PRE>
Common unarchiving code and unarchiving applets, ifupdown, ftpgetput,
nameif, sed, patch, fold, install, uudecode.
Various bugfixes, review and apply numerous patches.
</PRE>
<P>
Manuel Novoa <FONT SIZE="-1">III</FONT> &lt;<A HREF="mailto:mjn3@codepoet.org">mjn3@codepoet.org</A>&gt;
<P>
<PRE>
cat, head, mkfifo, mknod, rmdir, sleep, tee, tty, uniq, usleep, wc, yes,
mesg, vconfig, make_directory, parse_mode, dirname, mode_string,
get_last_path_component, simplify_path, and a number trivial libbb routines
also bug fixes, partial rewrites, and size optimizations in
ash, basename, cal, cmp, cp, df, du, echo, env, ln, logname, md5sum, mkdir,
mv, realpath, rm, sort, tail, touch, uname, watch, arith, human_readable,
interface, dutmp, ifconfig, route
</PRE>
<P>
Vladimir Oleynik &lt;<A HREF="mailto:dzo@simtreas.ru">dzo@simtreas.ru</A>&gt;
<P>
<PRE>
cmdedit; xargs(current), httpd(current);
ports: ash, crond, fdisk, inetd, stty, traceroute, top;
locale, various fixes
and irreconcilable critic of everything not perfect.
</PRE>
<P>
Bruce Perens &lt;<A HREF="mailto:bruce@pixar.com">bruce@pixar.com</A>&gt;
<P>
<PRE>
Original author of BusyBox in 1995, 1996. Some of his code can
still be found hiding here and there...
</PRE>
<P>
Tim Riker &lt;<A HREF="mailto:Tim@Rikers.org">Tim@Rikers.org</A>&gt;
<P>
<PRE>
bug fixes, member of fan club
</PRE>
<P>
Kent Robotti &lt;<A HREF="mailto:robotti@metconnect.com">robotti@metconnect.com</A>&gt;
<P>
<PRE>
reset, tons and tons of bug reports and patches.
</PRE>
<P>
Chip Rosenthal &lt;<A HREF="mailto:chip@unicom.com">chip@unicom.com</A>&gt;, &lt;<A HREF="mailto:crosenth@covad.com">crosenth@covad.com</A>&gt;
<P>
<PRE>
wget - Contributed by permission of Covad Communications
</PRE>
<P>
Pavel Roskin &lt;<A HREF="mailto:proski@gnu.org">proski@gnu.org</A>&gt;
<P>
<PRE>
Lots of bugs fixes and patches.
</PRE>
<P>
Gyepi Sam &lt;<A HREF="mailto:gyepi@praxis-sw.com">gyepi@praxis-sw.com</A>&gt;
<P>
<PRE>
Remote logging feature for syslogd
</PRE>
<P>
Linus Torvalds &lt;<A HREF="mailto:torvalds@transmeta.com">torvalds@transmeta.com</A>&gt;
<P>
<PRE>
mkswap, fsck.minix, mkfs.minix
</PRE>
<P>
Mark Whitley &lt;<A HREF="mailto:markw@codepoet.org">markw@codepoet.org</A>&gt;
<P>
<PRE>
grep, sed, cut, xargs(previous),
style-guide, new-applet-HOWTO, bug fixes, etc.
</PRE>
<P>
Charles P. Wright &lt;<A HREF="mailto:cpwright@villagenet.com">cpwright@villagenet.com</A>&gt;
<P>
<PRE>
gzip, mini-netcat(nc)
</PRE>
<P>
Enrique Zanardi &lt;<A HREF="mailto:ezanardi@ull.es">ezanardi@ull.es</A>&gt;
<P>
<PRE>
tarcat (since removed), loadkmap, various fixes, Debian maintenance
</PRE>
<P>
Tito Ragusa &lt;<A HREF="mailto:farmatito@tiscali.it">farmatito@tiscali.it</A>&gt;
<P>
<PRE>
devfsd and size optimizations in strings, openvt and deallocvt.
</PRE>
<P>
Paul Fox &lt;<A HREF="mailto:pgf@foxharp.boston.ma.us">pgf@foxharp.boston.ma.us</A>&gt;
<P>
<PRE>
vi editing mode for ash, various other patches/fixes
</PRE>
<P>
Roberto A. Foglietta &lt;<A HREF="mailto:me@roberto.foglietta.name">me@roberto.foglietta.name</A>&gt;
<P>
<PRE>
port: dnsd
</PRE>
<P>
Bernhard Reutner-Fischer &lt;<A HREF="mailto:rep.dot.nop@gmail.com">rep.dot.nop@gmail.com</A>&gt;
<P>
<PRE>
misc
</PRE>
<P>
Mike Frysinger &lt;<A HREF="mailto:vapier@gentoo.org">vapier@gentoo.org</A>&gt;
<P>
<PRE>
initial e2fsprogs, printenv, setarch, sum, misc
</PRE>
<P>
Jie Zhang &lt;<A HREF="mailto:jie.zhang@analog.com">jie.zhang@analog.com</A>&gt;
<P>
<PRE>
fixed two bugs in msh and hush (exitcode of killed processes)
</PRE>
<P>
<HR>
<A NAME="index">&nbsp;</A><H2>Index</H2>
<DL>
<DT id="250"><A HREF="#lbAB">NAME</A><DD>
<DT id="251"><A HREF="#lbAC">SYNTAX</A><DD>
<DT id="252"><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT id="253"><A HREF="#lbAE">USAGE</A><DD>
<DT id="254"><A HREF="#lbAF">COMMON OPTIONS</A><DD>
<DT id="255"><A HREF="#lbAG">COMMANDS</A><DD>
<DT id="256"><A HREF="#lbAH">COMMAND DESCRIPTIONS</A><DD>
<DT id="257"><A HREF="#lbAI">LIBC NSS</A><DD>
<DT id="258"><A HREF="#lbAJ">MAINTAINER</A><DD>
<DT id="259"><A HREF="#lbAK">AUTHORS</A><DD>
</DL>
<HR>
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using the manual pages.<BR>
Time: 00:05:08 GMT, March 31, 2021
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