33 lines
967 B
Markdown
33 lines
967 B
Markdown
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# sha1sum
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> Calculate SHA1 cryptographic checksums.
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> More information: <https://www.gnu.org/software/coreutils/manual/html_node/sha1sum-invocation.html>.
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- Calculate the SHA1 checksum for one or more files:
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`sha1sum {{path/to/file1 path/to/file2 ...}}`
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- Calculate and save the list of SHA1 checksums to a file:
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`sha1sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.sha1}}`
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- Calculate a SHA1 checksum from `stdin`:
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`{{command}} | sha1sum`
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- Read a file of SHA1 checksums and filenames and verify all files have matching checksums:
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`sha1sum --check {{path/to/file.sha1}}`
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- Only show a message for missing files or when verification fails:
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`sha1sum --check --quiet {{path/to/file.sha1}}`
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- Only show a message when verification fails, ignoring missing files:
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`sha1sum --ignore-missing --check --quiet {{path/to/file.sha1}}`
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- Check a known SHA1 checksum of a file:
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`echo {{known_sha1_checksum_of_the_file}} {{path/to/file}} | sha1sum --check`
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