mcookie(1)



MCOOKIE(1)                       User Commands                      MCOOKIE(1)

NAME
       mcookie - generate magic cookies for xauth

SYNOPSIS
       mcookie [options]

DESCRIPTION
       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
       order.

OPTIONS
       -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  suf-
              fixes 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  mean-
              ing  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.

BUGS
       It is assumed that none of the randomness sources will block.

FILES
       /dev/urandom
       /dev/random

SEE ALSO
       md5sum(1), X(1), xauth(1), rand(3)

AVAILABILITY
       The  mcookie command is part of the util-linux package and is available
       from Linux Kernel  Archive  <ftp://ftp.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux                       December 2014                      MCOOKIE(1)

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