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shasum(1p)


NAME

   shasum - Print or Check SHA Checksums

SYNOPSIS

    Usage: shasum [OPTION]... [FILE]...
    Print or check SHA checksums.
    With no FILE, or when FILE is -, read standard input.

      -a, --algorithm   1 (default), 224, 256, 384, 512, 512224, 512256
      -b, --binary      read in binary mode
      -c, --check       read SHA sums from the FILEs and check them
      -t, --text        read in text mode (default)
      -U, --UNIVERSAL   read in Universal Newlines mode
                            produces same digest on Windows/Unix/Mac
      -0, --01          read in BITS mode
                            ASCII '0' interpreted as 0-bit,
                            ASCII '1' interpreted as 1-bit,
                            all other characters ignored
      -p, --portable    read in portable mode (to be deprecated)

    The following two options are useful only when verifying checksums:
      -s, --status      don't output anything, status code shows success
      -w, --warn        warn about improperly formatted checksum lines

      -h, --help        display this help and exit
      -v, --version     output version information and exit

    When verifying SHA-512/224 or SHA-512/256 checksums, indicate the
    algorithm explicitly using the -a option, e.g.

      shasum -a 512224 -c checksumfile

    The sums are computed as described in FIPS PUB 180-4.  When checking,
    the input should be a former output of this program.  The default
    mode is to print a line with checksum, a character indicating type
    (`*' for binary, ` ' for text, `U' for UNIVERSAL, `^' for BITS, `?'
    for portable), and name for each FILE.

    Report shasum bugs to mshelor@cpan.org

DESCRIPTION

   Running shasum is often the quickest way to compute SHA message
   digests.  The user simply feeds data to the script through files or
   standard input, and then collects the results from standard output.

   The following command shows how to compute digests for typical inputs
   such as the NIST test vector "abc":

           perl -e "print qq(abc)" | shasum

   Or, if you want to use SHA-256 instead of the default SHA-1, simply
   say:

           perl -e "print qq(abc)" | shasum -a 256

   Since shasum mimics the behavior of the combined GNU sha1sum,
   sha224sum, sha256sum, sha384sum, and sha512sum programs, you can
   install this script as a convenient drop-in replacement.

   Unlike the GNU programs, shasum encompasses the full SHA standard by
   allowing partial-byte inputs.  This is accomplished through the BITS
   option (-0).  The following example computes the SHA-224 digest of the
   7-bit message 0001100:

           perl -e "print qq(0001100)" | shasum -0 -a 224

AUTHOR

   Copyright (c) 2003-2016 Mark Shelor <mshelor@cpan.org>.

SEE ALSO

   shasum is implemented using the Perl module Digest::SHA or
   Digest::SHA::PurePerl.



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