Linux Command Library


Print or Check SHA Checksums

- Calculate the SHA1 checksum for a file:
shasum [filename]

- Calculate the SHA256 checksum for a file:
shasum --algorithm 256 [filename]

- Calculate the SHA512 checksum for multiple files:
shasum --algorithm 512 [filename1] [filename2]

- Check a file with a list of sums against the directory's files:
shasum --check [list_file]

- Calculate the SHA1 checksum from stdin:
[somecommand] | shasum

 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 

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 

Copyright (c) 2003-2015 Mark Shelor <>.

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

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