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+.\" mcookie.1 --
+.\" Public Domain 1995 Rickard E. Faith (faith@cs.unc.edu)
+.TH MCOOKIE 1 "December 2014" "util-linux" "User Commands"
+.SH NAME
+mcookie \- generate magic cookies for xauth
+.SH SYNOPSIS
+.B mcookie
+[options]
+.SH DESCRIPTION
+.B mcookie
+generates a 128-bit random hexadecimal number for use with the X authority
+system.  Typical usage:
+.sp
+.RS
+.B xauth add :0 . `mcookie`
+.RE
+.PP
+The "random" number generated is actually the MD5 message
+digest of random information coming from one of the sources
+.IR getrandom ()
+system call,
+.IR /dev/urandom ,
+.IR /dev/random ,
+or the
+.IR "libc pseudo-random functions" ,
+in this preference order. See also the option \fB\-\-file\fR.
+.SH OPTIONS
+.TP
+.BR \-f , " \-\-file " \fIfile
+Use this \fIfile\fR as an additional source of randomness (for example /dev/urandom).
+When \fIfile\fR is '-', characters are read from standard input.
+.TP
+.BR \-m , " \-\-max\-size " \fInumber
+Read from \fIfile\fR only this \fInumber\fR of bytes.
+This option is meant to be used when reading additional
+randomness from a file or device.
+.IP
+The
+.I 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.
+.TP
+.BR \-v , " \-\-verbose"
+Inform where randomness originated, with amount of entropy read from each
+source.
+.TP
+.BR \-V , " \-\-version"
+Display version information and exit.
+.TP
+.BR \-h , " \-\-help"
+Display help text and exit.
+.SH FILES
+.I /dev/urandom
+.br
+.I /dev/random
+.SH BUGS
+It is assumed that none of the randomness sources will block.
+.SH SEE ALSO
+.BR md5sum (1),
+.BR X (7),
+.BR xauth (1),
+.BR rand (3)
+.SH AVAILABILITY
+The mcookie command is part of the util-linux package and is available from
+.UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
+Linux Kernel Archive
+.UE .