B2SUM(1)

📦
version 0.12.0 · 4 versions
, in ubuntu stonking

💖 b2sum(1) — the manual page, but make it cute 💖

okay so bestie. you found your way to b2sum(1), and honestly? iconic. this is the page for b2sum, the little command that prints and checks BLAKE2b checksums. it's giving "cryptographic vibe check for your files." no cap. let's get into it. 🦋

✨ NAME ✨

b2sum — print or check the BLAKE2b checksums 💅

🌸 SYNOPSIS 🌸

b2sum [OPTIONS] [FILE]...

🎀 DESCRIPTION 🎀

Print or check the BLAKE2b checksums.

that's it. that's the whole description. she's simple, she's powerful, she's literally the moment. 🫶

👑 OPTIONS 👑

  • -c, --check — read checksums from the FILEs and check them. verification era. ✅
  • -w, --warn — warn about improperly formatted checksum lines. she's gonna call it out, gently. 🙈
  • --status — don't output anything, status code shows success. silent but deadly (in a good way). 🤫
  • --quiet — don't print OK for each successfully verified file. only speak when something's wrong, main character restraint. 💜
  • --ignore-missing — don't fail or report status for missing files. we simply do not perceive them. ✨
  • --strict — exit non-zero for improperly formatted checksum lines. zero tolerance, periodt. 💀
  • -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. read that twice bestie, the rules are the rules. 📏
  • --tag — create a BSD style checksum. aesthetic variant unlocked. 🎀
  • -z, --zero — end each output line with NUL, not newline, and disable file name escaping. feral formatting, we love her for it. 🔥
  • -h, --help — Print help. the girlies love a help flag. 🌈
  • -V, --version — Print version. proof of lineage. ⭐

💜 VERSION 💜

v(uutils coreutils) 0.12.0

🦋 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. also, heads up bestie: as uutils is a work in progress, some examples might fail. it's not you, it's the WIP. 💖

okay that's the whole page 🧚 stay checksumming, stay hydrated, and remember: verify your files before you trust them, fr fr. this was b2sum(1) from the uutils coreutils, version v(uutils coreutils) 0.12.0, dated 2026-09-25 — mwah, bye bestie! 💅🌸🍓

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