68 lines
1.8 KiB
Groff
68 lines
1.8 KiB
Groff
.\" 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 /dev/urandom ,
|
|
.IR /dev/random ,
|
|
or the
|
|
.IR "libc pseudo-random functions" ,
|
|
in this preference order.
|
|
.SH OPTIONS
|
|
.TP
|
|
.BR \-f , " \-\-file " \fIfile
|
|
Use this \fIfile\fR as an additional source of randomness.
|
|
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 BUGS
|
|
It is assumed that none of the randomness sources will block.
|
|
.SH FILES
|
|
.I /dev/urandom
|
|
.br
|
|
.I /dev/random
|
|
.SH "SEE ALSO"
|
|
.BR X (1),
|
|
.BR xauth (1),
|
|
.BR md5sum (1),
|
|
.BR rand (3)
|
|
.SH AVAILABILITY
|
|
The mcookie command is part of the util-linux package and is available from
|
|
.UR ftp://\:ftp.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
|
|
Linux Kernel Archive
|
|
.UE .
|