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sulogin(8)


NAME

   sulogin - single-user login

SYNOPSIS

   sulogin [options] [tty]

DESCRIPTION

   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.

OPTIONS

   -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 start a root shell
          without asking for a password.

          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.

ENVIRONMENT VARIABLES

   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.

AUTHOR

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

AVAILABILITY

   The  sulogin command is part of the util-linux package and is available
   from Linux Kernel  Archive  ftp://ftp.kernel.org/pub/linux/utils/util-
   linux/.



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