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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" shasum \- Print or Check SHA Checksums .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 3 \& Usage: shasum [OPTION]... [FILE]... \& Print or check SHA checksums. \& With no FILE, or when FILE is \-, read standard input. \& \& \-a, \-\-algorithm 1 (default), 224, 256, 384, 512, 512224, 512256 \& \-b, \-\-binary read in binary mode \& \-c, \-\-check read SHA sums from the FILEs and check them \& \-p, \-\-portable read files in portable mode \& produces same digest on Windows/Unix/Mac \& \-t, \-\-text read 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 checksum lines \& \& \-h, \-\-help display this help and exit \& \-v, \-\-version output version information and exit \& \& When verifying SHA\-512/224 or SHA\-512/256 checksums, indicate the \& algorithm explicitly using the \-a option, e.g. \& \& shasum \-a 512224 \-c checksumfile \& \& The sums are computed as described in FIPS\-180\-4. 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 text, \`?\*(Aq for portable), and name for each FILE. \& \& Report shasum bugs to mshelor@cpan.org .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" Running \fIshasum\fR is often the quickest way to compute \s-1SHA\s0 message digests. The user simply feeds data to the script through files or standard input, and then collects the results from standard output. .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 qq(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 qq(abc)" | shasum \-a 256 .Ve .PP Since \fIshasum\fR mimics the behavior of the combined \s-1GNU\s0 \fIsha1sum\fR, \&\fIsha224sum\fR, \fIsha256sum\fR, \fIsha384sum\fR, and \fIsha512sum\fR programs, you can install this script as a convenient drop-in replacement. .SH "AUTHOR" .IX Header "AUTHOR" Copyright (c) 2003\-2011 Mark Shelor . .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIshasum\fR is implemented using the Perl module Digest::SHA or Digest::SHA::PurePerl.