comm(3tcl) on Linux
The text 4e0de1bfcb15, as Debian 10 (Buster) shipped it.
A remote communication facility for Tcl (8.3 and later)
Flags it lists
-
-chan -
-events -
-interp -
-listen -
-local -
-port -
-serial -
-silent -
-socket -
-socketcmd