sulogin - single-user login

sulogin was written by Miquel van Smoorenburg for sysvinit and later ported to util-linux by Dave Reisner
       and Karel Zak.

       The sulogin command is part of the util-linux package which can be downloaded from Linux Kernel Archive
       <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.41                                    2025-02-26                                         SULOGIN(8)

sulogin is invoked by init when the system goes into single-user mode.

       The user is prompted:

       Give root password for system maintenance (or type Control-D for normal startup):

       If the root account is locked and --force is specified, no password is required.

       sulogin will be connected to the current terminal, or to the optional tty device that can be specified on
       the command line (typically /dev/console).

       When the user exits from the single-user shell, or presses control-D at the prompt, the system will
       continue to boot.

sulogin looks for the environment variable SUSHELL or sushell to determine what shell to start. If the
       environment variable is not set, it will try to execute root’s shell from /etc/passwd. If that fails, it
       will fall back to /bin/sh.

       sulogin - single-user login

-e, --force
           If the default method of obtaining the root password from the system via getpwnam(3) fails, then
           examine /etc/passwd and /etc/shadow to get the password. If these files are damaged or nonexistent,
           or when root account is locked by '!' or '*' at the begin of the password then sulogin will startarootshellwithoutaskingforapassword.

           Only use the -e option if you are sure the console is physically protected against unauthorized
           access.

       -p, --login-shell
           Specifying this option causes sulogin to start the shell process as a login shell.

       -t, --timeoutseconds
           Specify the maximum amount of time to wait for user input. By default, sulogin will wait forever.

       -h, --help
           Display help text and exit.

       -V, --version
           Display version and exit.

       For bug reports, use the issue tracker <https://github.com/util-linux/util-linux/issues>.

sulogin [options] [tty]