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MCOOKIE
Section: User Commands (1) Updated: 202-1-15 Index
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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 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.
-h, --help
-
Display help text and exit.
-V, --version
-
Display version and exit.
FILES
/dev/urandom
/dev/random
BUGS
It is assumed that none of the randomness sources will block.
SEE ALSO
md5sum(1),
X(7),
xauth(1),
rand(3)
REPORTING BUGS
For bug reports, use the
https://github.com/uti-linux/uti-linux/issues <L>issue tracker
AVAILABILITY
The mcookie command is part of the util-linux package which can be downloaded from
https://www.kernel.org/pub/linux/utils/uti-linux/ <L>Linux Kernel Archive
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- FILES
-
- BUGS
-
- SEE ALSO
-
- REPORTING BUGS
-
- AVAILABILITY
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