snippetbashTip

b3sum — Calculate BLAKE3 cryptographic checksums. More information: <https://github.com/BLAKE3-team/BLAKE3/t

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

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Problem

How to use the b3sum command: Calculate BLAKE3 cryptographic checksums. More information: <https://github.com/BLAKE3-team/BLAKE3/tree/master/b3sum>.

Solution

b3sum — Calculate BLAKE3 cryptographic checksums. More information: <https://github.com/BLAKE3-team/BLAKE3/tree/master/b3sum>.

Calculate the BLAKE3 checksum for one or more files:

b3sum {{path/to/file1 path/to/file2 ...}}

Calculate and save the list of BLAKE3 checksums to a file:

b3sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.b3}}

Calculate a BLAKE3 checksum from stdin:

{{command}} | b3sum

Read a file of BLAKE3 checksums and filenames and verify all files have matching checksums:

b3sum {{[-c|--check]}} {{path/to/file.b3}}

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

b3sum {{[-c|--check]}} --quiet {{path/to/file.b3}}

Check a known BLAKE3 checksum of a file:

echo {{known_blake3_checksum_of_the_file}} {{path/to/file}} | b3sum {{[-c|--check]}}

Code Snippets

Calculate the BLAKE3 checksum for one or more files

b3sum {{path/to/file1 path/to/file2 ...}}

Calculate and save the list of BLAKE3 checksums to a file

b3sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.b3}}

Calculate a BLAKE3 checksum from `stdin`

{{command}} | b3sum

Read a file of BLAKE3 checksums and filenames and verify all files have matching checksums

b3sum {{[-c|--check]}} {{path/to/file.b3}}

Only show a message for missing files or when verification fails

b3sum {{[-c|--check]}} --quiet {{path/to/file.b3}}

Context

tldr-pages: common/b3sum

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