tldr/pages/osx/shasum.md

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# shasum
> Calculate or check cryptographic SHA checksums.
- Calculate the SHA1 checksum for a file:
`shasum {{filename}}`
- Calculate the SHA256 checksum for a file:
`shasum --algorithm 256 {{filename}}`
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- Calculate the SHA512 checksum for multiple files:
`shasum --algorithm 512 {{filename1}} {{filename2}}`
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- Check a file with a list of sums against the directory's files:
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`shasum --check {{list_file}}`
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- Calculate the SHA1 checksum from `stdin`:
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`{{somecommand}} | shasum`