tsum.1 - plan9port - [fork] Plan 9 from user space
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tsum.1 (1388B)
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1 .TH SUM 1
2 .SH NAME
3 sum, md5sum, sha1sum \- sum and count blocks in a file
4 .SH SYNOPSIS
5 .B sum
6 [
7 .B -5r
8 ]
9 [
10 .I file ...
11 ]
12 .PP
13 .B md5sum
14 [
15 .I file ...
16 ]
17 .PP
18 .B sha1sum
19 [
20 .I file ...
21 ]
22 .SH DESCRIPTION
23 By default,
24 .I sum
25 calculates and prints a 32-bit hexadecimal checksum,
26 a byte count,
27 and the name of
28 each
29 .IR file .
30 The checksum is also a function of the input length.
31 If no files are given,
32 the standard input is
33 summed.
34 Other summing algorithms are available.
35 The options are
36 .TP
37 .B -r
38 Sum with the algorithm of System V's
39 .B "sum -r"
40 and print the length (in 1K blocks) of the input.
41 .TP
42 .B -5
43 Sum with System V's default algorithm
44 and print the length (in 512-byte blocks) of the input.
45 .PP
46 .I Sum
47 is typically used to look for bad spots,
48 to validate a file communicated over
49 some transmission line or
50 as a quick way to determine if two files on different machines might be the same.
51 .PP
52 .B Md5sum
53 computes the 32 hex digit RSA Data Security, Inc. MD5 Message-Digest Algorithm
54 described in RFC1321.
55 If no
56 .I files
57 are given,
58 the standard input is
59 summed.
60 .PP
61 .B Sha1sum
62 computes the 40 hex digit National Institute of Standards and Technology SHA1 secure hash algorithm
63 described in FIPS PUB 180-1.
64 If no
65 .I files
66 are given,
67 the standard input is
68 summed.
69 .SH SOURCE
70 .B \*9/src/cmd/sum.c
71 .br
72 .B \*9/src/cmd/md5sum.c
73 .br
74 .B \*9/src/cmd/sha1sum.c
75 .SH "SEE ALSO"
76 .MR cmp (1) ,
77 .MR wc (1)