tldr/pages/common/b2sum.md

b2sum

Calculate BLAKE2 cryptographic checksums. More information: https://www.gnu.org/software/coreutils/manual/html_node/b2sum-invocation.html.

• Calculate the BLAKE2 checksum for one or more files:

b2sum {{path/to/file1 path/to/file2 ...}}

• Calculate and save the list of BLAKE2 checksums to a file:

b2sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.b2}}

• Calculate a BLAKE2 checksum from stdin:

{{command}} | b2sum

• Read a file of BLAKE2 checksums and filenames and verify all files have matching checksums:

b2sum {{[-c|--check]}} {{path/to/file.b2}}

• Only show a message for missing files or when verification fails:

b2sum {{[-c|--check]}} --quiet {{path/to/file.b2}}

• Only show a message when verification fails, ignoring missing files:

b2sum --ignore-missing {{[-c|--check]}} --quiet {{path/to/file.b2}}

• Check a known BLAKE2 checksum of a file:

echo {{known_blake2_checksum_of_the_file}} {{path/to/file}} | b2sum {{[-c|--check]}}