136 lines
3.2 KiB
HTML
136 lines
3.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of MCOOKIE</TITLE>
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</HEAD><BODY>
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<H1>MCOOKIE</H1>
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Section: User Commands (1)<BR>Updated: December 2014<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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mcookie - generate magic cookies for xauth
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>mcookie</B>
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[options]
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>mcookie</B>
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generates a 128-bit random hexadecimal number for use with the X authority
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system. Typical usage:
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<P>
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<DL COMPACT><DT id="1"><DD>
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<B>xauth add :0 . `mcookie`</B>
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</DL>
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<P>
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The "random" number generated is actually the MD5 message
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digest of random information coming from one of the sources
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<I>getrandom</I>()
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system call,
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<I>/dev/urandom</I>,
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<I>/dev/random</I>,
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or the
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<I>libc pseudo-random functions</I>,
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in this preference order. See also the option <B>--file</B>.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT id="2"><B>-f</B>,<B> --file </B><I>file</I>
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<DD>
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Use this <I>file</I> as an additional source of randomness (for example /dev/urandom).
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When <I>file</I> is '-', characters are read from standard input.
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<DT id="3"><B>-m</B>,<B> --max-size </B><I>number</I>
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<DD>
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Read from <I>file</I> only this <I>number</I> of bytes.
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This option is meant to be used when reading additional
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randomness from a file or device.
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<DT id="4"><DD>
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The
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<I>number</I>
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argument may be followed by the multiplicative suffixes KiB=1024,
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MiB=1024*1024, and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB" is
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optional, e.g., "K" has the same meaning as "KiB") or the suffixes
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KB=1000, MB=1000*1000, and so on for GB, TB, PB, EB, ZB and YB.
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<DT id="5"><B>-v</B>,<B> --verbose</B>
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<DD>
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Inform where randomness originated, with amount of entropy read from each
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source.
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<DT id="6"><B>-V</B>,<B> --version</B>
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<DD>
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Display version information and exit.
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<DT id="7"><B>-h</B>,<B> --help</B>
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<DD>
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Display help text and exit.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>BUGS</H2>
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It is assumed that none of the randomness sources will block.
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<A NAME="lbAG"> </A>
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<H2>FILES</H2>
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<I>/dev/urandom</I>
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<BR>
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<I>/dev/random</I>
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+md5sum">md5sum</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+X">X</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+xauth">xauth</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?3+rand">rand</A></B>(3)
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<A NAME="lbAI"> </A>
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<H2>AVAILABILITY</H2>
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The mcookie command is part of the util-linux package and is available from
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Linux Kernel Archive
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="8"><A HREF="#lbAB">NAME</A><DD>
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<DT id="9"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="10"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="11"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="12"><A HREF="#lbAF">BUGS</A><DD>
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<DT id="13"><A HREF="#lbAG">FILES</A><DD>
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<DT id="14"><A HREF="#lbAH">SEE ALSO</A><DD>
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<DT id="15"><A HREF="#lbAI">AVAILABILITY</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:19 GMT, March 31, 2021
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</BODY>
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</HTML>
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