tldr/pages/common/b2sum.md

b2sum

Calculate BLAKE2 cryptographic checksums. More information: https://www.gnu.org/software/coreutils/b2sum.

• Calculate the BLAKE2 checksum for a file:

b2sum {{path/to/file}}

• Calculate BLAKE2 checksums for multiple files:

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

• Calculate the BLAKE2 checksum from stdin:

{{some_command}} | b2sum

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

b2sum --check {{path/to/file.b2}}

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

b2sum --check --quiet {{path/to/file.b2}}

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

b2sum --ignore-missing --check --quiet {{path/to/file.b2}}