tldr/pages/linux/sha256sum.md

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# sha256sum
> Calculate SHA256 cryptographic checksums.
- Calculate the SHA256 checksum for file(s) or files in a directory, one checksum per file:
`sha256sum {{filename1}}`
`sha256sum {{filename1}} {{filename2}}`
`sha256sum {{directory/\*}}`
- Read a file of SHA256 sums and verify all files have matching checksums:
`sha256sum -c {{filename.sha256}}`