tldr/pages/common/sha1sum.md

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# sha1sum
> Calculate SHA1 cryptographic checksums.
> More information: <https://www.gnu.org/software/coreutils/manual/html_node/sha1sum-invocation.html>.
- Calculate the SHA1 checksum for a file:
`sha1sum {{filename1}}`
- Calculate SHA1 checksums for multiple files:
`sha1sum {{filename1}} {{filename2}}`
- Calculate and save the list of SHA1 checksums to a file:
`sha1sum {{filename1}} {{filename2}} > {{filename.sha1}}`
- Read a file of SHA1 sums and verify all files have matching checksums:
`sha1sum --check {{filename.sha1}}`
- Only show a message for files for which verification fails:
`sha1sum --check --quiet {{filename.sha1}}`