| .TH SUM 1 |
| .SH NAME |
| sum, md5sum, sha1sum \- sum and count blocks in a file |
| .SH SYNOPSIS |
| .B sum |
| [ |
| .B -5r |
| ] |
| [ |
| .I file ... |
| ] |
| .PP |
| .B md5sum |
| [ |
| .I file ... |
| ] |
| .PP |
| .B sha1sum |
| [ |
| .I file ... |
| ] |
| .SH DESCRIPTION |
| By default, |
| .I sum |
| calculates and prints a 32-bit hexadecimal checksum, |
| a byte count, |
| and the name of |
| each |
| .IR 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 |
| .TP |
| .B -r |
| Sum with the algorithm of System V's |
| .B "sum -r" |
| and print the length (in 1K blocks) of the input. |
| .TP |
| .B -5 |
| Sum with System V's default algorithm |
| and print the length (in 512-byte blocks) of the input. |
| .PP |
| .I 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. |
| .PP |
| .B Md5sum |
| computes the 32 hex digit RSA Data Security, Inc. MD5 Message-Digest Algorithm |
| described in RFC1321. |
| If no |
| .I files |
| are given, |
| the standard input is |
| summed. |
| .PP |
| .B Sha1sum |
| computes the 40 hex digit National Institute of Standards and Technology SHA1 secure hash algorithm |
| described in FIPS PUB 180-1. |
| If no |
| .I files |
| are given, |
| the standard input is |
| summed. |
| .SH SOURCE |
| .B \*9/src/cmd/sum.c |
| .br |
| .B \*9/src/cmd/md5sum.c |
| .br |
| .B \*9/src/cmd/sha1sum.c |
| .SH "SEE ALSO" |
| .IR cmp (1), |
| .IR wc (1) |
