utmpupdate
$ utmpupdate [--create] [--delete] [--PID PID] [--from From] <tty>
--help
: Display help message and exit--version
: Print version-c
, --create
: Create entry-d
, --delete
: Delete entry-p PID
, --PID PID
: PID-f From
, --from From
: Fromtty
: TTY name