tnftp(1) on Linux
The text 41fa02e1c1d2, as Debian 12 (Bookworm) 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 -
-x