nl(1) on Linux
The text d21a66cafcd1, as Debian 12 (Bookworm) shipped it.
number lines of files
Flags it lists
-
--body-numbering -
--footer-numbering -
--header-numbering -
--help -
--join-blank-lines -
--line-increment -
--no-renumber -
--number-format -
--number-separator -
--number-width -
--section-delimiter -
--starting-line-number -
--version -
-b -
-d -
-f -
-h -
-i -
-l -
-n -
-p -
-s -
-v -
-w