Man page - mcookie(1)
Packages contains this manual
- getopt(1)
- x86_64(8)
- zramctl(8)
- findfs(8)
- blockdev(8)
- ipcmk(1)
- linux64(8)
- ldattach(8)
- findmnt(8)
- unshare(1)
- uclampset(1)
- partx(8)
- lscpu(1)
- flock(1)
- fallocate(1)
- setterm(1)
- terminal-colors.d(5)
- setsid(1)
- setarch(8)
- lsns(8)
- adjtime_config(5)
- chcpu(8)
- runuser(1)
- rtcwake(8)
- rev(1)
- lsipc(1)
- blkdiscard(8)
- nsenter(1)
- whereis(1)
- dmesg(1)
- fsck(8)
- blkid(8)
- ipcs(1)
- mcookie(1)
- lsblk(8)
- readprofile(8)
- switch_root(8)
- wdctl(8)
- mountpoint(1)
- lsmem(1)
- fsfreeze(8)
- i386(8)
- pivot_root(8)
- swaplabel(8)
- scols-filter(5)
- getty(8)
- chmem(8)
- chrt(1)
- agetty(8)
- blkzone(8)
- more(1)
- choom(1)
- mkswap(8)
- wipefs(8)
- taskset(1)
- lslocks(8)
- linux32(8)
- ionice(1)
- isosize(8)
- su(1)
- rename.ul(1)
- prlimit(1)
- namei(1)
- lslogins(1)
- ipcrm(1)
- fstrim(8)
- mkfs(8)
- hardlink(1)
- sulogin(8)
- setpriv(1)
apt-get install util-linux
Available languages:
en fr pl ja uk ro sr deManual
MCOOKIE
NAMESYNOPSIS
DESCRIPTION
OPTIONS
FILES
BUGS
SEE ALSO
REPORTING BUGS
AVAILABILITY
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 issue tracker <https://github.com/util-linux/util-linux/issues>.
AVAILABILITY
The 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/>.