NAME
sum - display file checksums and block counts
SYNOPSIS
sum [-a alg] [-o 1|2] [file ...]DESCRIPTION
sum outputs three space separated values: file checksum, file size, and file name. The output can be useful for indicating errors in transmitted files. You should not use sum for security checks as they are easily fooled. If no file names are specified, the standard input will be used.
OPTIONS
- -a blake224
-
BLAKE/224 algorithm (requires Digest::BLAKE)
- -a blake256
-
BLAKE/256 algorithm (requires Digest::BLAKE)
- -a blake384
-
BLAKE/384 algorithm (requires Digest::BLAKE)
- -a blake512
-
BLAKE/512 algorithm (requires Digest::BLAKE)
- -a crc
-
CRC32 algorithm
- -a jh224
-
JH/224 algorithm (requires Digest::JH)
- -a jh256
-
JH/256 algorithm (requires Digest::JH)
- -a jh384
-
JH/384 algorithm (requires Digest::JH)
- -a jh512
-
JH/512 algorithm (requires Digest::JH)
- -a haval256
-
Haval256 algorithm (requires Digest::Haval256)
- -a md2
-
MD2 algorithm (requires Digest::MD2)
- -a md4
-
MD4 algorithm (requires Digest::MD4)
- -a md5
-
MD5 algorithm
- -a sha1
-
SHA-1 algorithm
- -a sha224
-
SHA-2/256 algorithm
- -a sha256
-
SHA-2/256 algorithm
- -a sha384
-
SHA-2/384 algorithm
- -a sha512
-
SHA-2/512 algorithm
- -a sha3-224
-
SHA-3/224 algorithm (requires Digest::SHA3)
- -a sha3-256
-
SHA-3/256 algorithm (requires Digest::SHA3)
- -a sha3-384
-
SHA-3/384 algorithm (requires Digest::SHA3)
- -a sha3-512
-
SHA-3/512 algorithm (requires Digest::SHA3)
- -a whirlpool
-
Whirlpool algorithm (requires Digest::Whirlpool)
- -o 1
-
Historic BSD algorithm
- -o 2
-
Historic SYSV algorithm
NOTES
sum returns 0 on success or 1 if an error occurred.
If the program was executed as "cksum" the default algorithm is CRC32, otherwise the default algorithm is BSD.
The BSD and SYSV algorithms round up to the next block count for partial blocks.
The CRC32 algorithm was ported directly from OpenBSD cksum C source code.
HISTORY
Perl version rewritten for the Perl Power Tools project from the description of the cksum program in OpenBSD.
AUTHOR
Theo Van Dinter (felicity@kluge.net)
SEE ALSO
md5sum(1)