tldr/pages/linux/sha1sum.md

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# sha1sum
> Calculate SHA1 cryptographic checksums
- Calculate the SHA1 checksum for file(s) or files in a directory, one checksum per file
`sha1sum {{filename1}}`
`sha1sum {{filename1}} {{filename2}}`
`sha1sum {{directory/\*}}`
- Read a file of SHA1 sums and verify all files have matching checksums
`sha1sum -c {{filename.sha1}}`