mcookie(1) [debian man page]

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 output of the MD5 message digest fed with various pieces of random information: the current
       time, the process id, the parent process id, and optionally the contents of an input file. and several bytes of information from the  first
       of the following devices which is present: /dev/random, /dev/urandom, files in /proc, /dev/audio.

OPTIONS

       -f, --file=FILE
	      Use file as a macig cookie seed. When file is defined as `-' character input is read from stdin.

       -v, --verbose
	      Explain what is being done.

       -V, --version
	      Output version information and exit.

       -h, --help
	      Display this help and exit.

BUGS

       The entropy in the generated 128-bit is probably quite small (and, therefore, vulnerable to attack) unless a non-pseudorandom number gener-
       ator is used (e.g., /dev/random under Linux).

       It is assumed that none of the devices opened will block.

FILES

       /dev/random
       /dev/urandom
       /dev/audio
       /proc/stat
       /proc/loadavg

SEE ALSO

       X(1), xauth(1), md5sum(1)

AVAILABILITY

       The mcookie command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							     June 2011								MCOOKIE(1)

UUIDGEN(1)							   User Commands							UUIDGEN(1)

NAME

       uuidgen - create a new UUID value

SYNOPSIS

       uuidgen [options]

DESCRIPTION

       The uuidgen program creates (and prints) a new universally unique identifier (UUID) using the libuuid(3) library.  The new UUID can reason-
       ably be considered unique among all UUIDs created on the local system, and among UUIDs created on other systems in  the	past  and  in  the
       future.

       There  are two types of UUIDs which uuidgen can generate: time-based UUIDs and random-based UUIDs.  By default uuidgen will generate a ran-
       dom-based UUID if a high-quality random number generator is present.  Otherwise, it will choose a time-based UUID.  It is possible to force
       the generation of one of these two UUID types by using the -r or -t options.

OPTIONS

       -r, --random
	      Generate	a  random-based UUID.  This method creates a UUID consisting mostly of random bits.  It requires that the operating system
	      have a high quality random number generator, such as /dev/random.

       -t, --time
	      Generate a time-based UUID.  This method creates a UUID based on the system clock plus the system's ethernet  hardware  address,	if
	      present.

       -h, --help
	      Display help text and exit.

       -V, --version
	      Display version information and exit.

CONFORMING TO

       OSF DCE 1.1

AUTHOR

       uuidgen was written by Andreas Dilger for libuuid.

AVAILABILITY

       The uuidgen command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

SEE ALSO

       libuuid(3)

util-linux							     June 2011								UUIDGEN(1)