SHASUM(1)

💅 SHASUM(1) 💅

Hey bestie! This is the Perl Programmers Reference Guide page for shasum — Print or Check SHA Checksums. ✨

---

💖 NAME 💖

shasum — Print or Check SHA Checksums.

---

🎀 SYNOPSIS 🎀

Okay so here’s the whole vibe:

Usage: shasum [OPTION]... [FILE]...
Print or check SHA checksums.
With no FILE, or when FILE is -, read standard input.

• -a, --algorithm — pick the SHA algorithm: 1 (the default), 224, 256, 384, 512, 512224, or 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; this produces the 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; the 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, — a literal space — 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. 💖

Here’s 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 <mshelor@cpan.org>. 💖

---

🌈 SEE ALSO 🌈

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

---

Okay bestie, that’s the whole page! 💖 This page is from perl v5.42.3, dated 2026-11-03. Stay checksummed and slay! 🫶✨