netkit-ftp(1) on Linux
The text 1c28fdd90097, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it. The page shows this text now.
Internet file transfer program
Flags it lists
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-4 -
-6 -
-d -
-e -
-g -
-i -
-n -
-p -
-v