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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | BUGS | SEE ALSO | AVAILABILITY | COLOPHON |
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MCOOKIE(1) User Commands MCOOKIE(1)
mcookie - generate magic cookies for xauth
mcookie [options]
mcookie generates a 128-bit random hexadecimal number for use
with the X authority system. Typical usage:
xauth add :0 . `mcookie`
The "random" number generated is actually the MD5 message digest
of random information coming from one of the sources getrandom()
system call, /dev/urandom, /dev/random, or the libc pseudo-random
functions, in this preference order. See also the option --file.
-f, --file file
Use this file as an additional source of randomness (for
example /dev/urandom). When file is '-', characters are
read from standard input.
-m, --max-size number
Read from file only this number of bytes. This option is
meant to be used when reading additional randomness from a
file or device.
The number argument may be followed by the multiplicative
suffixes KiB=1024, MiB=1024*1024, and so on for GiB, TiB,
PiB, EiB, ZiB and YiB (the "iB" is optional, e.g., "K" has
the same meaning as "KiB") or the suffixes KB=1000,
MB=1000*1000, and so on for GB, TB, PB, EB, ZB and YB.
-v, --verbose
Inform where randomness originated, with amount of entropy
read from each source.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
/dev/urandom
/dev/random
It is assumed that none of the randomness sources will block.
md5sum(1), X(7), xauth(1), rand(3)
The mcookie command is part of the util-linux package and is
available from Linux Kernel Archive
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found
at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you
have a bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
util-linux December 2014 MCOOKIE(1)
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