btrfs-usage-report(1) on Linux
The text c6a80b9c514a, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it. The page shows this text now.
show a detailed usage report about your btrfs filesystem
Flags it lists
-
--help -
-h