sum, md5sum, sha1sum - sum and count blocks in a file sum [ -5r ] [ file ... ]

md5sum [ file ... ]

sha1sum [ -2 bits ] [ 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 file s are given, the standard input is summed. Other summing algorithms are available. The options are .TF -r

-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.

Sha1sum computes the 40 hex digit National Institute of Standards and Technology (NIST) SHA1 secure hash algorithm described in FIPS PUB 180-1, by default. Given the .L 2 option, it instead computes the bits -bit NIST SHA2 secure hash algorithm described in FIPS PUB 180-2 and prints the hash in hex. Currently supported values of bits are 224, 256, 384, and 512.

/sys/src/cmd/sum.c

/sys/src/cmd/md5sum.c

/sys/src/cmd/sha1sum.c

cmp (1), wc (1), sechash (2)