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Perl 5 version 14.0 documentation
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shasum - Print or Check SHA Checksums


  1. Usage: shasum [OPTION]... [FILE]...
  2. Print or check SHA checksums.
  3. With no FILE, or when FILE is -, read standard input.
  4. -a, --algorithm 1 (default), 224, 256, 384, 512, 512224, 512256
  5. -b, --binary read in binary mode
  6. -c, --check read SHA sums from the FILEs and check them
  7. -p, --portable read files in portable mode
  8. produces same digest on Windows/Unix/Mac
  9. -t, --text read in text mode (default)
  10. The following two options are useful only when verifying checksums:
  11. -s, --status don't output anything, status code shows success
  12. -w, --warn warn about improperly formatted checksum lines
  13. -h, --help display this help and exit
  14. -v, --version output version information and exit
  15. When verifying SHA-512/224 or SHA-512/256 checksums, indicate the
  16. algorithm explicitly using the -a option, e.g.
  17. shasum -a 512224 -c checksumfile
  18. The sums are computed as described in FIPS-180-4. When checking, the
  19. input should be a former output of this program. The default mode is to
  20. print a line with checksum, a character indicating type (`*' for binary,
  21. ` ' for text, `?' for portable), and name for each FILE.
  22. Report shasum bugs to


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 easy it is to compute digests for typical inputs such as the NIST test vector "abc":

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

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

  1. 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.


Copyright (c) 2003-2011 Mark Shelor <>.


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