file(1) on Linux
The text 904563fa4fb3, as Debian 2.1 (Slink) shipped it.
determine file type
Flags it lists
-
--brief -
--checking-printout -
--dereference -
--files-from -
--help -
--magic-file -
--uncompress -
--version -
-L -
-b -
-c -
-f -
-m -
-z