duck(1) on Linux
The text e573873d4b3c, as Debian 10 (Buster) shipped it.
the Debian Url ChecKer
Flags it lists
-
--color -
--disable-urlfix -
--enable-urlfix -
--missing-helpers -
--modules-dir -
--no-check-certificate -
--no-https -
--tasks -
--version -
-A -
-C -
-F -
-P -
-S -
-U -
-c -
-f -
-l -
-n -
-q -
-u -
-v