proxycheck(1) on Linux
The text a20ea6a059a6, as Debian 13 (Trixie), Debian 12 (Bookworm) shipped it. The page shows this text now.
open proxy server checker
Flags it lists
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-D -
-M -
-a -
-b -
-h -
-i -
-m -
-n -
-p -
-s -
-t -
-v -
-x