tnftp(1) on Linux
The text e2a4e56351da, as Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
Internet file transfer program
Flags it lists
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-4 -
-6 -
-A -
-N -
-P -
-R -
-T -
-V -
-a -
-d -
-e -
-f -
-g -
-i -
-n -
-o -
-p -
-q -
-r -
-s -
-t -
-v