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NAMEmcookie - generate magic cookies for xauth SYNOPSISmcookie [options] DESCRIPTIONmcookie 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(2) system call, /dev/urandom, /dev/random, or the libc pseudo-random functions, in this preference order. See also the option --file. OPTIONS-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.
FILES/dev/urandom /dev/random BUGSIt is assumed that none of the randomness sources will block. SEE ALSOmd5sum(1), X(7), xauth(1), rand(3) REPORTING BUGSFor bug reports, use the issue tracker at <https://github.com/karelzak/util-linux/issues>. AVAILABILITYThe mcookie command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.
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