b2sum

Options

--binary, -b

read in binary mode

--check, -c

read hashsums from the FILEs and check them

--tag

create a BSD-style checksum

--text, -t

read in text mode (default)

--quiet, -q

don't print OK for each successfully verified file

--status, -s

don't output anything, status code shows success

--strict

exit non-zero for improperly formatted checksum lines

--ignore-missing

don't fail or report status for missing files

--warn, -w

warn about improperly formatted checksum lines

--zero, -z

end each output line with NUL, not newline

Examples

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 --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 when verification fails, ignoring missing files:

b2sum --ignore-missing --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 --check

The examples are provided by the tldr-pages project under the CC BY 4.0 License.

Please note that, as uutils is a work in progress, some examples might fail.