procan(1) on Linux
The text d79fd01c051d, as Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
Multipurpose relay (SOcket CAT)
Flags it lists
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-4 -
-6 -
-? -
-?? -
-??? -
-D -
-U -
-V -
-d -
-g -
-h -
-hh -
-hhh -
-lh -
-lm -
-ls -
-lu -
-ly -
-s -
-u -
-v -
-x