sethdlc(8) on Linux
The text adb09a89f6c3, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye) shipped it. The page shows this text now.
get/set Linux HDLC packet radio modem driver port information
Flags it lists
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-b -
-d -
-h -
-i -
-s