Section (1) mcookie
mcookie — generate magic cookies for xauth
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/random, or the
functions, in this preference order. See also the
Use this file as an additional source of randomness (for example /dev/urandom). When file is _zsingle_quotesz_-_zsingle_quotesz_, characters are read from standard input.
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.
The mcookie command is part of the util-linux package and is available from Linux Kernel Archive
Public Domain 1995 Rickard E. Faith (faithcs.unc.edu)