96 lines
No EOL
2.6 KiB
Groff
96 lines
No EOL
2.6 KiB
Groff
'\" t
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.\" Title: mcookie
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.\" Author: [see the "AUTHOR(S)" section]
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.\" Generator: Asciidoctor 2.0.20
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.\" Date: 2025-02-26
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.\" Manual: User Commands
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.\" Source: util-linux 2.41
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.\" Language: English
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.\"
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.TH "MCOOKIE" "1" "2025-02-26" "util\-linux 2.41" "User Commands"
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.ss \n[.ss] 0
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.nh
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.ad l
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.de URL
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\fI\\$2\fP <\\$1>\\$3
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..
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.als MTO URL
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.if \n[.g] \{\
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. mso www.tmac
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. am URL
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. ad l
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. .
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. am MTO
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. ad l
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. .
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. LINKSTYLE blue R < >
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.\}
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.SH "NAME"
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mcookie \- generate magic cookies for xauth
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.SH "SYNOPSIS"
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.sp
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\fBmcookie\fP [options]
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.SH "DESCRIPTION"
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.sp
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\fBmcookie\fP generates a 128\-bit random hexadecimal number for use with the X authority system. Typical usage:
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.RS 3
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.ll -.6i
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.sp
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\fBxauth add :0 . \f(CRmcookie\fP\fP
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.br
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.RE
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.ll
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.sp
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The "random" number generated is actually the MD5 message digest of random information coming from one of the sources \fBgetrandom\fP(2) system call, \fI/dev/urandom\fP, \fI/dev/random\fP, or the \fIlibc pseudo\-random functions\fP, in this preference order. See also the option \fB\-\-file\fP.
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.SH "OPTIONS"
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.sp
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\fB\-f\fP, \fB\-\-file\fP \fIfile\fP
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.RS 4
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Use this \fIfile\fP as an additional source of randomness (for example \fI/dev/urandom\fP). When \fIfile\fP is \*(Aq\-\*(Aq, characters are read from standard input.
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.RE
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.sp
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\fB\-m\fP, \fB\-\-max\-size\fP \fInumber\fP
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.RS 4
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Read from \fIfile\fP only this \fInumber\fP of bytes. This option is meant to be used when reading additional randomness from a file or device.
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.sp
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The \fInumber\fP 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.
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.RE
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.sp
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\fB\-v\fP, \fB\-\-verbose\fP
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.RS 4
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Inform where randomness originated, with amount of entropy read from each source.
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.RE
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.sp
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\fB\-h\fP, \fB\-\-help\fP
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.RS 4
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Display help text and exit.
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.RE
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.sp
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\fB\-V\fP, \fB\-\-version\fP
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.RS 4
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Display version and exit.
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.RE
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.SH "FILES"
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.sp
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\fI/dev/urandom\fP
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.sp
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\fI/dev/random\fP
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.SH "BUGS"
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.sp
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It is assumed that none of the randomness sources will block.
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.SH "SEE ALSO"
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.sp
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\fBmd5sum\fP(1),
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\fBX\fP(7),
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\fBxauth\fP(1),
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\fBrand\fP(3)
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.SH "REPORTING BUGS"
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.sp
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For bug reports, use the \c
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.URL "https://github.com/util\-linux/util\-linux/issues" "issue tracker" "."
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.SH "AVAILABILITY"
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.sp
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The \fBmcookie\fP command is part of the util\-linux package which can be downloaded from \c
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.URL "https://www.kernel.org/pub/linux/utils/util\-linux/" "Linux Kernel Archive" "." |