klogind(8) on Linux
The text 5d530e6f96c8, as Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
remote login server
Flags it lists
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-4 -
-5 -
-D -
-L -
-M -
-P -
-S -
-c -
-e -
-f -
-i -
-k -
-p -
-w