| SUM(1) | 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 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.

`Sha1sum` computes the 40 hex digit National Institute of Standards and Technology SHA1 secure hash algorithm described in FIPS PUB 180-1. If no files are given, the standard input is summed.

SOURCE

| `/usr/local/plan9/src/cmd/sum.c /usr/local/plan9/src/cmd/md5sum.c /usr/local/plan9/src/cmd/sha1sum.c`

SEE ALSO

| cmp(1), wc(1)