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+.\" mcookie.1 --
+.\" Public Domain 1995 Rickard E. Faith (faith@cs.unc.edu)
+.TH MCOOKIE 1 "June 2011" "util-linux" "User Commands"
+.SH NAME
+mcookie \- generate magic cookies for xauth
+.SH SYNOPSIS
+.B mcookie
+[\fIoptions\fR]
+.SH DESCRIPTION
+.B mcookie
+generates a 128-bit random hexadecimal number for use with the X authority
+system.  Typical usage:
+.RS
+xauth add :0 . `mcookie`
+.RE
+.PP
+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:
+.IR /dev/random ,
+.IR /dev/urandom ,
+files in
+.IR /proc ,
+.IR /dev/audio .
+.SH OPTIONS
+.TP
+\fB\-f\fR, \fB\-\-file\fR=\fIFILE\fR
+Use file as a macig cookie seed. When file is defined as `-' character
+input is read from stdin.
+.TP
+\fB\-v\fR, \fB\-\-verbose\fR
+Explain what is being done.
+.TP
+\fB\-V\fR, \fB\-\-version\fR
+Output version information and exit.
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Display this help and exit.
+.SH BUGS
+The entropy in the generated 128-bit is probably quite small (and,
+therefore, vulnerable to attack) unless a non-pseudorandom number generator
+is used (e.g.,
+.I /dev/random
+under Linux).
+.PP
+It is assumed that none of the devices opened will block.
+.SH FILES
+.I /dev/random
+.br
+.I /dev/urandom
+.br
+.I /dev/audio
+.br
+.I /proc/stat
+.br
+.I /proc/loadavg
+.SH "SEE ALSO"
+.BR X (1),
+.BR xauth (1),
+.BR md5sum (1)
+.SH AVAILABILITY
+The mcookie command is part of the util-linux package and is available from
+ftp://ftp.kernel.org/pub/linux/utils/util-linux/.