sulogin --version (return code: 0)
sulogin from util-linux 2.27.1
sulogin --help (return code: 0)
Usage:
sulogin [options] [tty device]
Single-user login.
Options:
-p, --login-shell start a login shell
-t, --timeout <seconds> max time to wait for a password (default: no limit)
-e, --force examine password files directly if getpwnam(3) fails
-h, --help display this help and exit
-V, --version output version information and exit
For more details see sulogin(8).