shasum.1

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.\" ========================================================================
.\"
.IX Title "SHASUM 1"
.TH SHASUM 1 "2008-01-23" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
shasum \- Print or Check SHA Checksums
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\& Usage: shasum [OPTION] [FILE]...
\&    or: shasum [OPTION] \-\-check [FILE]
\& Print or check SHA checksums.
\& With no FILE, or when FILE is \-, read standard input.
\&
\&  \-a, \-\-algorithm    1 (default), 224, 256, 384, 512
\&  \-b, \-\-binary       read files in binary mode (default on DOS/Windows)
\&  \-c, \-\-check        check SHA sums against given list
\&  \-p, \-\-portable     read files in portable mode
\&                         produces same digest on Windows/Unix/Mac
\&  \-t, \-\-text         read files in text mode (default)
\&
\& The following two options are useful only when verifying checksums:
\&
\&  \-s, \-\-status       don\*(Aqt output anything, status code shows success
\&  \-w, \-\-warn         warn about improperly formatted SHA checksum lines
\&
\&  \-h, \-\-help         display this help and exit
\&  \-v, \-\-version      output version information and exit
\&
\& The sums are computed as described in FIPS PUB 180\-2.  When checking,
\& the input should be a former output of this program.  The default mode
\& is to print a line with checksum, a character indicating type (\`*\*(Aq
\& for binary, \`?\*(Aq for portable, \` \*(Aq for text), and name for each FILE.
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fIshasum\fR script provides the easiest and most convenient way to
compute \s-1SHA\s0 message digests.  Rather than writing a program, the user
simply feeds data to the script via the command line, and waits for
the results to be printed on standard output.  Data can be fed to
\&\fIshasum\fR through files, standard input, or both.
.PP
The following command shows how easy it is to compute digests for typical
inputs such as the \s-1NIST\s0 test vector \*(L"abc\*(R":
.PP
.Vb 1
\&        perl \-e "print qw(abc)" | shasum
.Ve
.PP
Or, if you want to use \s-1SHA\-256\s0 instead of the default \s-1SHA\-1\s0, simply say:
.PP
.Vb 1
\&        perl \-e "print qw(abc)" | shasum \-a 256
.Ve
.PP
Since \fIshasum\fR uses the same interface employed by the familiar
\&\fIsha1sum\fR program (and its somewhat outmoded anscestor \fImd5sum\fR),
you can install this script as a convenient drop-in replacement.
.SH "AUTHOR"
.IX Header "AUTHOR"
Copyright (c) 2003\-2007 Mark Shelor <[e-mail]>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
shasum is implemented using the Perl module Digest::SHA or
Digest::SHA::PurePerl.