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[linuxjm/jm.git] / manual / gnumaniak / original / man1 / md5sum.1

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+.\" You may copy, distribute and modify under the terms of the LDP General
+.\" Public License as specified in the LICENSE file that comes with the
+.\" gnumaniak distribution
+.\"
+.\" The author kindly requests that no comments regarding the "better"
+.\" suitability or up-to-date notices of any info documentation alternative
+.\" is added without contacting him first.
+.\"
+.\" (C) 2002 Ragnar Hojland Espinosa <ragnar@ragnar-hojland.com>
+.\"
+.\"    GNU md5sum man page
+.\"    man pages are NOT obsolete!
+.\"    <ragnar@ragnar-hojland.com>
+.TH MD5SUM 1 "7 October 2002" "GNU textutils 2.1"
+.SH NAME
+\fBmd5sum\fR \- calculate and check MD5 hash checksums
+.SH SYNOPSIS
+.B md5sum
+.RB [ \-bctw ]
+.RB [ \-\-binary ]
+.RB [ \-\-check ]
+.RB [ \-\-status ]
+.RB [ \-\-text ]
+.RB [ \-\-warn ]
+.RI [ FILE... ]
+
+.BR md5sum " [" \-\-help "] [" \-\-version ]
+.SH DESCRIPTION
+.B md5sum
+computes and prints a 128-bit checksum (or "fingerprint" or
+"message-digest") for each given
+.IR FILE .
+If
+.I FILE
+is omitted or if it is a
+.RB ` \- ',
+standard input is used for reading.
+
+Output format when calculating checksums consists for each input \fIFILE\fR,
+in a MD5 sum, a space, a file type character (`*' for binary, ` ' for text)
+and a filename.  This is the format \fB\-\-check\fR expects.
+.SH OPTIONS
+.TP
+.B \-b, \-\-binary
+Reads the input \fIFILE\fRs in binary mode. This option has no effect on Unix
+systems, since they don't distinguish between binary and text files.  This is
+the default on DOS platforms. 
+.TP
+.B \-c, \-\-check
+Reads filenames and checksums from the given \fIFILE\fRs, and report wether
+each file and the corresponding checksum are correct.  \fb\-\-check\fR
+expects the same format \fBmd5sum\fR outputs.
+.sp
+.nf
+For example:
+md5sum *.txt > checksums.md5
+md5sum \-\-check checksums.md5
+.fi
+.TP
+.B \-\-text
+Treat all input files as text files.
+.TP
+.B \-w, \-\-warn
+When verifying checksums, warn about improperly formatted MD5
+checksum lines.  This option is useful only if all but a few lines
+in the checked input are valid.               
+.TP
+.B \-\-status
+Silently exit with a status return code.  Warnings or checksum failures are
+omitted, and errors from operations such as opening are reading are printed.
+A successful exit code of 0 is only returned is everything is passed and no
+errors have ocurred.  Otherwise a non-zero value is returned.
+.TP
+.B "\-\-help"
+Print a usage message on standard output and exit successfully.
+.TP
+.B "\-\-version"
+Print version information on standard output then exit successfully.
+.SH NOTES
+Report bugs to bug-textutils@gnu.org.
+.br
+Man page by Ragnar Hojland Espinosa <ragnar@ragnar-hojland.com>