shasum(1)

1SHASUM(1)             User Contributed Perl Documentation            SHASUM(1)
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NAME

6       shasum - Print or Check SHA Checksums
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SYNOPSIS

9        Usage: shasum [OPTION]... [FILE]...
10        Print or check SHA checksums.
11        With no FILE, or when FILE is -, read standard input.
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13          -a, --algorithm   1 (default), 224, 256, 384, 512, 512224, 512256
14          -b, --binary      read in binary mode
15          -c, --check       read SHA sums from the FILEs and check them
16              --tag         create a BSD-style checksum
17          -t, --text        read in text mode (default)
18          -U, --UNIVERSAL   read in Universal Newlines mode
19                                produces same digest on Windows/Unix/Mac
20          -0, --01          read in BITS mode
21                                ASCII '0' interpreted as 0-bit,
22                                ASCII '1' interpreted as 1-bit,
23                                all other characters ignored
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25        The following five options are useful only when verifying checksums:
26              --ignore-missing  don't fail or report status for missing files
27          -q, --quiet           don't print OK for each successfully verified file
28          -s, --status          don't output anything, status code shows success
29              --strict          exit non-zero for improperly formatted checksum lines
30          -w, --warn            warn about improperly formatted checksum lines
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32          -h, --help        display this help and exit
33          -v, --version     output version information and exit
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35        When verifying SHA-512/224 or SHA-512/256 checksums, indicate the
36        algorithm explicitly using the -a option, e.g.
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38          shasum -a 512224 -c checksumfile
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40        The sums are computed as described in FIPS PUB 180-4.  When checking,
41        the input should be a former output of this program.  The default
42        mode is to print a line with checksum, a character indicating type
43        (`*' for binary, ` ' for text, `U' for UNIVERSAL, `^' for BITS),
44        and name for each FILE.  The line starts with a `\' character if the
45        FILE name contains either newlines or backslashes, which are then
46        replaced by the two-character sequences `\n' and `\\' respectively.
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48        Report shasum bugs to mshelor@cpan.org
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DESCRIPTION

51       Running shasum is often the quickest way to compute SHA message
52       digests.  The user simply feeds data to the script through files or
53       standard input, and then collects the results from standard output.
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55       The following command shows how to compute digests for typical inputs
56       such as the NIST test vector "abc":
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58               perl -e "print qq(abc)" | shasum
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60       Or, if you want to use SHA-256 instead of the default SHA-1, simply
61       say:
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63               perl -e "print qq(abc)" | shasum -a 256
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65       Since shasum mimics the behavior of the combined GNU sha1sum,
66       sha224sum, sha256sum, sha384sum, and sha512sum programs, you can
67       install this script as a convenient drop-in replacement.
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69       Unlike the GNU programs, shasum encompasses the full SHA standard by
70       allowing partial-byte inputs.  This is accomplished through the BITS
71       option (-0).  The following example computes the SHA-224 digest of the
72       7-bit message 0001100:
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74               perl -e "print qq(0001100)" | shasum -0 -a 224
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AUTHOR

77       Copyright (C) 2003-2018 Mark Shelor <mshelor@cpan.org>.
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NAME

SYNOPSIS

DESCRIPTION

AUTHOR

SEE ALSO