tldr/pages/common/sha1sum.md

sha1sum

Calculate SHA1 cryptographic checksums. More information: https://www.gnu.org/software/coreutils/sha1sum.

• Calculate the SHA1 checksum for a file:

sha1sum {{path/to/file}}

• Calculate SHA1 checksums for multiple files:

sha1sum {{path/to/file1}} {{path/to/file2}}

• Calculate and save the list of SHA1 checksums to a file:

sha1sum {{path/to/file1}} {{path/to/file2}} > {{path/to/file.sha1}}

• Read a file of SHA1 sums and verify all files have matching checksums:

sha1sum --check {{path/to/file.sha1}}

• Only show a message for missing files or when verification fails:

sha1sum --check --quiet {{path/to/file.sha1}}

• Only show a message for files for which verification fails, ignoring missing files:

sha1sum --ignore-missing --check --quiet {{path/to/file.sha1}}