FreeBSD Manual Pages
SUM(1) General Commands Manual SUM(1) NAME sum, md5sum, sha1sum - sum and count blocks in a file SYNOPSIS sum [ -5r ] [ file ... ] md5sum [ file ... ] sha1sum [ file ... ] DESCRIPTION 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 are -r Sum with the algorithm of System V's sum -r and print the length (in 1K blocks) of the input. -5 Sum with System V's default algorithm and print the length (in 512-byte blocks) of the input. Sum is typically used to look for bad spots, to validate a file communi- cated 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. Sha1sum computes the 40 hex digit National Institute of Standards and Tech- nology SHA1 secure hash algorithm described in FIPS PUB 180-1. If no files are given, the standard input is summed. SOURCE /src/cmd/sum.c /src/cmd/md5sum.c /src/cmd/sha1sum.c SEE ALSO cmp((1)), wc((1)) SUM(1)
NAME | SYNOPSIS | DESCRIPTION | SOURCE | SEE ALSO
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