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Linux 2.6 - man page for shasum (linux section 1)

SHASUM(1)			 Perl Programmers Reference Guide			SHASUM(1)

       shasum - Print or Check SHA Checksums

	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't 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 (`*'
	for binary, `?' for portable, ` ' for text), and name for each FILE.

       The shasum script provides the easiest and most convenient way to compute SHA 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 shasum through files, standard input, or both.

       The following command shows how easy it is to compute digests for typical inputs such as
       the NIST test vector "abc":

	       perl -e "print qw(abc)" | shasum

       Or, if you want to use SHA-256 instead of the default SHA-1, simply say:

	       perl -e "print qw(abc)" | shasum -a 256

       Since shasum uses the same interface employed by the familiar sha1sum program (and its
       somewhat outmoded anscestor md5sum), you can install this script as a convenient drop-in

       Copyright (c) 2003-2008 Mark Shelor <mshelor@cpan.org>.

       shasum is implemented using the Perl module Digest::SHA or Digest::SHA::PurePerl.

perl v5.12.4				    2013-03-18					SHASUM(1)

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