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<title>sum(1) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>SUM(1)</b><td align=right><b>SUM(1)</b>
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<p><font size=+1><b>NAME </b></font><br>
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sum, md5sum, sha1sum – sum and count blocks in a file<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>sum</font></tt> [ <tt><font size=+1>−5r</font></tt> ] [ <i>file ...</i> ]
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<tt><font size=+1>md5sum</font></tt> [ <i>file ...</i> ]
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<tt><font size=+1>sha1sum</font></tt> [ <i>file ...</i> ]<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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By default, <i>sum</i> calculates and prints a 32-bit hexadecimal checksum,
a byte count, and the name of each <i>file</i>. The checksum is also
a function of the input length. If no files are given, the standard
input is summed. Other summing algorithms are available. The options
are<br>
<tt><font size=+1>−r</font></tt> Sum with the algorithm of System V’s <tt><font size=+1>sum −r</font></tt> and print the length
(in 1K blocks) of the input.<br>
<tt><font size=+1>−5</font></tt> Sum with System V’s default algorithm and print the length (in
512-byte blocks) of the input.
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<i>Sum</i> is typically used to look for bad spots, to validate a file
communicated over some transmission line or as a quick way to
determine if two files on different machines might be the same.
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<tt><font size=+1>Md5sum</font></tt> computes the 32 hex digit RSA Data Security, Inc. MD5 Message-Digest
Algorithm described in RFC1321. If no <i>files</i> are given, the standard
input is summed.
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<tt><font size=+1>Sha1sum</font></tt> computes the 40 hex digit National Institute of Standards
and Technology SHA1 secure hash algorithm described in FIPS PUB
180-1. If no <i>files</i> are given, the standard input is summed.<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/cmd/sum.c<br>
/usr/local/plan9/src/cmd/md5sum.c<br>
/usr/local/plan9/src/cmd/sha1sum.c<br>
</font></tt>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man1/cmp.html"><i>cmp</i>(1)</a>, <a href="../man1/wc.html"><i>wc</i>(1)</a><br>
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