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RedHat 9 (Linux i386) - man page for sulogin (redhat section 8)

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SULOGIN(8)		       Linux System Administrator's Manual		       SULOGIN(8)

       sulogin -- Single-user login

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

       sulogin can be invoked by init(8) when the system goes into single user mode (this is done
       through an entry in inittab(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 maintenance
	    (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

       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	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.

       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 methods first.  If the -e  option  was
       specified, sulogin examines 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 irrepairably damaged.

       /etc/shadow (if present)

       Miquel van Smoorenburg <miquels@cistron.nl>

       init(8), inittab(5).

					   11 Sep 2000				       SULOGIN(8)
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