snippetbashTip

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

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the b2sum command: Calculate BLAKE2 cryptographic checksums. More information: <https://www.gnu.org/software/coreutils/manual/html_node/b2sum-invocation.html>.

Solution

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]}}

Code Snippets

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

Context

tldr-pages: common/b2sum

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