GRUB-FSTEST(1)

📦
version 2.12 · 6 versions
, in fedora 43, fedora 44

💅 grub-fstest — the manual page, but make it make sense

okay so bestie, welcome to GRUB-FSTEST(1), one of the User Commands, and honestly? it's giving "backstage pass to the filesystem drivers." no cap. 🎀

✨ NAME ✨

grub-fstest — a debug tool for GRUB filesystem drivers 🦋

🌸 SYNOPSIS 🌸

grub-fstest [OPTION...] IMAGE_PATH COMMANDS

👑 DESCRIPTION 👑

Bestie. This is a debug tool for filesystem driver. That's the whole vibe. It pokes at an image and runs little commands on it so you can see what the driver is actually doing. 💅

🫶 Commands:

  • blocklist FILE — shows you the blocklist of FILE. like, the receipts of where it lives on disk. 💖
  • cat FILE — copies FILE straight to standard output. yes, cat behaviour, iconic. ✨
  • cmp FILE LOCAL — compares FILE against the local file LOCAL. vibe check, but for bytes. 🔥
  • cp FILE LOCAL — copies FILE to the local file LOCAL. 🎀
  • crc FILE — gets the crc32 checksum of FILE. math girlies rise. 🌈
  • hex FILE — shows the contents of FILE in hex. 🧚
  • ls PATH — lists the files in PATH. classic. 💜
  • xnu_uuid DEVICE — computes the XNU UUID of the device. 😭

⭐ Options:

  • -c, --diskcount=NUM — specifies the number of input files. 🫶
  • -C, --crypto — mounts crypto devices. 🔐
  • -d, --debug=STRING — sets the debug environment variable. 👑
  • -K, --zfs-key=FILE|prompt — loads the zfs crypto key. either from a file or it'll ask you, hence prompt. 💅
  • -n, --length=NUM — handles N bytes in the output file. 🌸
  • -r, --root=DEVICE_NAME — sets the root device. 💖
  • -s, --skip=NUM — skips N bytes from the output file. 🦋
  • -u, --uncompress — uncompresses data. ✨
  • -v, --verbose — print verbose messages. lowercase and unbothered, exactly as written. 😌
  • -?, --help — give this help list. 🎀
  • --usage — give a short usage message. short queen. 🌈
  • -V, --version — print program version. ⭐
Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options. fr fr, that's just how it works. 💀

🌸 SEE ALSO 🌸

The full documentation for grub-fstest is maintained as a Texinfo manual. If the info and grub-fstest programs are properly installed at your site, the command

info grub-fstest

should give you access to the complete manual. 📖✨

and that's a wrap bestie 💅 this was GRUB 2.12, dated April 2026 — go forth and debug those filesystem drivers, you ate. 🎀🦋💖

📦 where this page comes from