Manual: shasum

SHASUM(1)				      Perl Programmers Reference Guide					   SHASUM(1)

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
	      --tag	    create a BSD-style checksum
	  -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

	The following five options are useful only when verifying checksums:
	      --ignore-missing	don't fail or report status for missing files
	  -q, --quiet		don't print OK for each successfully verified file
	  -s, --status		don't output anything, status code shows success
	      --strict		exit non-zero for improperly formatted checksum lines
	  -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),
	and name for each FILE.	 The line starts with a `\' character if the
	FILE name contains either newlines or backslashes, which are then
	replaced by the two-character sequences `\n' and `\\' respectively.

	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) 2003-2023 Mark Shelor .

SEE ALSO
       shasum is implemented using the Perl module Digest::SHA.

perl v5.40.1						 2026-06-12						   SHASUM(1)