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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) 2003-2018 Mark Shelor <mshelor@cpan.org>.

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

perl v5.34.0			  2021-08-27			     SHASUM(1)

NAME | SYNOPSIS | DESCRIPTION | AUTHOR | SEE ALSO

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