plogin(1) on Linux
The text 9512e4fcbb17, as Debian 10 (Buster) shipped it.
Cisco login script
Flags it lists
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-E -
-S -
-V -
-c -
-d -
-e -
-f -
-h -
-i -
-p -
-s -
-t -
-u -
-v -
-w -
-x -
-y