shasum 命令

常用示例

说明

shasum is a unified Perl-based utility for computing and verifying SHA message digests across all algorithm variants. The -a option selects the algorithm: SHA-1 (default), SHA-224, SHA-256, SHA-384, SHA-512, and the truncated SHA-512/224 and SHA-512/256 variants. SHA-256 is the most commonly used for software distribution verification and security applications. In check mode (-c), shasum reads a file containing previously generated checksums and verifies each listed file against its recorded hash, reporting success or failure. Output format shows the hash followed by the filename, with BSD-style output (--tag) additionally including the algorithm name. Both formats are understood during verification. This command is the standard SHA utility on macOS and systems with Perl installed, providing equivalent functionality to the separate sha1sum, sha256sum, and sha512sum commands found in GNU coreutils.

参数

-a _ALG_

Algorithm (1, 224, 256, 384, 512, 512224, 512256).

-b

Binary mode.

-c, --check

Check hashes from file.

-t

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, '1' as 1-bit).

-s, --status

Status only, don't output anything (with -c).

--ignore-missing

Don't fail or report status for missing files (with -c).

-q, --quiet

Don't print OK for each successfully verified file (with -c).

-w, --warn

Warn about improperly formatted checksum lines.

--strict

Exit non-zero for improperly formatted lines.

--tag

BSD-style output including algorithm name.

-h, --help

Show help.