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sha256sum

Calculate SHA256 cryptographic checksums. More information: https://www.gnu.org/software/coreutils/manual/html_node/sha2-utilities.html.

  • Calculate the SHA256 checksum for a file:

sha256sum {{filename1}}

  • Calculate SHA256 checksums for multiple files:

sha256sum {{filename1}} {{filename2}}

  • Calculate and save the list of SHA256 checksums to a file:

sha256sum {{filename1}} {{filename2}} > {{filename.sha256}}

  • Read a file of SHA256 sums and verify all files have matching checksums:

sha256sum --check {{filename.sha256}}

  • Only show a message for files for which verification fails:

sha256sum --check --quiet {{filename.sha256}}