sulogin man page on Archlinux

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SULOGIN(8)		     System Administration		    SULOGIN(8)

       sulogin - Single-user login

       sulogin [options] [tty]

       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):

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

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

       -e, --force
	      If the default method of obtaining the root password via	getpw‐
	      nam(3)  from  the system fails, manually examine /etc/passwd and
	      /etc/shadow to get the password.	If they are damaged or	nonex‐
	      istent,  sulogin	will  start  a root shell without asking for a

	      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, --timeout seconds
	      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 information and exit.

       sulogin looks for the environment variable SUSHELL or sushell to deter‐
       mine 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 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 and is available
       from Linux Kernel  Archive  ⟨

util-linux			   Jul 2012			    SULOGIN(8)

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