sha1sum — Compute and Check SHA-1 Checksums

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The sha1sum command calculates a SHA-1 checksum for a file. It can be useful for basic file comparison, but SHA-1 is no longer preferred for security-sensitive verification.

Create a checksum

sha1sum file.tar.gz

Save and verify

sha1sum file.tar.gz > file.tar.gz.sha1
sha1sum -c file.tar.gz.sha1

For modern downloads, use SHA-256 checksums when provided by the project or vendor.

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