ftptop(1) on Linux
The text 385cc07953df, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye) shipped it. The page shows this text now.
display running status on proftpd server connections
Flags it lists
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-A -
-D -
-I -
-S -
-U -
-V -
-a -
-b -
-d -
-f -
-i -
-n