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
-p, --portable read files in portable mode
produces same digest on Windows/Unix/Mac
-t, --text read in text mode (default)
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-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, `?' for portable), and name for each FILE.
Report shasum bugs to mshelor[:at:]cpan[:dot:]org
add an example, a script, a trick and tips
examples
source
alias sha224="shasum -a 224"
alias sha256="shasum -a 256"
alias sha512="shasum -a 512"
source
date +%s | shasum -a 256 | base64 | head -c $NUM_CHARS ; echo
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 easy it is 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.
see also
shasum
is implemented using the Perl module Digest::SHA or
Digest::SHA::PurePerl.
author
Copyright (c)
2003-2011 Mark Shelor <mshelor[:at:]cpan[:dot:]org>.