sessreg(1) on Linux
The text 6954f9ff9b6d, as Debian 9 (Stretch) shipped it.
manage utmpx/wtmpx entries for non-init clients
Flags it lists
-
-L -
-V -
-a -
-d -
-h -
-l -
-s -
-t -
-u -
-w -
-x