netselect(1) on Linux
The text ccbd21ab8df4, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
choose the fastest server automatically
Flags it lists
-
-D -
-I -
-m -
-s -
-t -
-v -
-vv -
-vvv -
-vvvv