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 /dev/urandom,
/dev/random, or the libc pseudo-random functions, in this preference
-f, --file file
Use this file as an additional source of randomness. 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.
Inform where randomness originated, with amount of entropy
read from each source.
Display version information and exit.
Display help text and exit.
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
email@example.com. This page was obtained from the
project's upstream Git repository
2017-03-13. If you discover any rendering problems in this HTML ver‐
sion 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 man‐
ual page), send a mail to firstname.lastname@example.org
util-linux December 2014 MCOOKIE(1)