tnftp(1) on Linux
The text a362387e7ba3, as Debian 11 (Bullseye) shipped it.
Internet file transfer program
Flags it lists
-
-4 -
-6 -
-A -
-N -
-P -
-R -
-T -
-V -
-a -
-d -
-e -
-f -
-g -
-i -
-n -
-o -
-p -
-q -
-r -
-s -
-t -
-v -
-x