NAME¶

b2sum - Print or check the BLAKE2b checksums

SYNOPSIS¶

b2sum [-c|--check] [-w|--warn] [--status] [--quiet] [--ignore-missing] [--strict] [-l|--length] [--tag] [-t|--text] [-z|--zero] [-h|--help] [-V|--version] [file]

DESCRIPTION¶

Print or check the BLAKE2b checksums

OPTIONS¶

-c, --check

read checksums from the FILEs and check them

-w, --warn

warn about improperly formatted checksum lines

--status

don't output anything, status code shows success

--quiet

don't print OK for each successfully verified file

--ignore-missing

don't fail or report status for missing files

--strict

exit non-zero for improperly formatted checksum lines

-l, --length

digest length in bits; must not exceed the max size and must be a multiple of 8 for blake2b; must be 224, 256, 384, or 512 for sha2 or sha3

--tag

create a BSD style checksum

-t, --text

read in text mode (default)

-z, --zero

end each output line with NUL, not newline, and disable file name escaping

-h, --help

Print help

-V, --version

Print version

VERSION¶

v(uutils coreutils) 0.9.0

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 [-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]

The examples are provided by the tldr-pages project <https://tldr.sh> under the CC BY 4.0 License. Please note that, as uutils is a work in progress, some examples might fail.