1SHASUM(1)              Perl Programmers Reference Guide              SHASUM(1)
2
3
4

NAME

6       shasum - Print or Check SHA Checksums
7

SYNOPSIS

9        Usage: shasum [OPTION] [FILE]...
10           or: shasum [OPTION] --check [FILE]
11        Print or check SHA checksums.
12        With no FILE, or when FILE is -, read standard input.
13
14         -a, --algorithm    1 (default), 224, 256, 384, 512
15         -b, --binary       read files in binary mode (default on DOS/Windows)
16         -c, --check        check SHA sums against given list
17         -p, --portable     read files in portable mode
18                                produces same digest on Windows/Unix/Mac
19         -t, --text         read files in text mode (default)
20
21        The following two options are useful only when verifying checksums:
22
23         -s, --status       don't output anything, status code shows success
24         -w, --warn         warn about improperly formatted SHA checksum lines
25
26         -h, --help         display this help and exit
27         -v, --version      output version information and exit
28
29        The sums are computed as described in FIPS PUB 180-2.  When checking,
30        the input should be a former output of this program.  The default mode
31        is to print a line with checksum, a character indicating type (`*'
32        for binary, `?' for portable, ` ' for text), and name for each FILE.
33

DESCRIPTION

35       The shasum script provides the easiest and most convenient way to
36       compute SHA message digests.  Rather than writing a program, the user
37       simply feeds data to the script via the command line, and waits for the
38       results to be printed on standard output.  Data can be fed to shasum
39       through files, standard input, or both.
40
41       The following command shows how easy it is to compute digests for
42       typical inputs such as the NIST test vector "abc":
43
44               perl -e "print qw(abc)" | shasum
45
46       Or, if you want to use SHA-256 instead of the default SHA-1, simply
47       say:
48
49               perl -e "print qw(abc)" | shasum -a 256
50
51       Since shasum uses the same interface employed by the familiar sha1sum
52       program (and its somewhat outmoded anscestor md5sum), you can install
53       this script as a convenient drop-in replacement.
54

AUTHOR

56       Copyright (c) 2003-2008 Mark Shelor <mshelor@cpan.org>.
57

SEE ALSO

59       shasum is implemented using the Perl module Digest::SHA or
60       Digest::SHA::PurePerl.
61
62
63
64perl v5.12.4                      2011-11-04                         SHASUM(1)
Impressum