Plan 9 - man page for sum (plan9 section 1)
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sum, md5sum - sum and count blocks in a file
sum [ -5r ] [ file ... ]
md5sum [ file ... ]
By default, sum calculates and prints a 32-bit hexadecimal checksum, a byte count, and the
name of each file. 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
-r Sum with the algorithm of System V's sum -r and print the length (in 1K blocks) of
-5 Sum with System V's default algorithm and print the length (in 512-byte blocks) of
Sum 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.
Md5sum computes the 32 hex digit RSA Data Security, Inc. MD5 Message-Digest Algorithm
described in RFC1321. If no files are given, the standard input is summed.
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