socat(1) on Linux
The text c3c2ab83450e, as Debian 3.1 (Sarge) shipped it.
Multipurpose relay (SOcket CAT)
Flags it lists
-
-? -
-?? -
-??? -
-D -
-U -
-V -
-d -
-g -
-h -
-hh -
-hhh -
-lf -
-lm -
-ls -
-lu -
-ly -
-s -
-u -
-v -
-x