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       sulogin [ -e ] [ -p ] [ -t timeout ] [ tty-device ]


       sulogin  is  invoked  by init(8) when the system goes into
       single user mode (this is done through an entry  in  init­
       tab(5)).  Init  also  tries  to execute sulogin when it is
       passed the -b flag from the bootmonitor (eg, LILO).

       The user is prompted

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

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

       If the -p flag was set,  the  single-user  shell  will  be
       invoked  with  a  dash  as the first character in argv[0].
       That will cause most shells to behave as  a  login  shell.
       The  default is not to do this, so that the shell will not
       read /etc/profile or $HOME/.profile at startup.

       After the user exits the  single-user  shell,  or  presses
       control-d  at  the  prompt,  the system will (continue to)
       boot to the default runlevel.


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

       This is very valuable together with the -b flag  to  init.
       To  boot  the  system into single user mode, with the root
       file system mounted read/write, using a special "failsafe"
       shell that is statically linked (this example is valid for
       the LILO bootprompt)

       boot: linux -b rw sushell=/sbin/sash


       sulogin checks the root password using the standard  meth­
       ods  first.  If the -e option was specified, sulogin exam­
       ines the next files to find the root password. If they are
       damaged,  or  non-existant,  it  will use fallback methods
       that even go so far as to provide you with a shell  prompt
       without  asking  for  the  root password if they are irre­
       pairably damaged.

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