checkbashisms(1) on Linux
The text c74d1ed33fee, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
check for bashisms in /bin/sh scripts
Flags it lists
-
--extra -
--force -
--help -
--newline -
--posix -
--version -
-f -
-h -
-n -
-p -
-v -
-x