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Full Discussion: su (-) command
Top Forums UNIX for Advanced & Expert Users su (-) command Post 27900 by Kelam_Magnus on Monday 9th of September 2002 11:36:46 AM
Old 09-09-2002
to be perfectly in control ... script it...

something in a script would be more reliable. Then you could take whatever was entered after "su" as variables.

You would have to move the su binary somewhere out of the PATH and then create a script in the original location called "su".

Then anything after the command will be read as input which you can then force the result you want by coding it in a script.

This should be fairly easy to do probably only 20 lines or so.


My 2K anyway.Smilie

Smilie
 

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

NAME
sulogin - Single-user login SYNOPSIS
sulogin [ -e ] [ -p ] [ -t SECONDS ] [ TTY ] DESCRIPTION
sulogin is 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 the boot loader (e.g., grub(8)) passes it the -b option. The user is prompted Give root password for system maintenance (or type Control-D for normal startup): If the root account is locked, no password prompt is displayed and sulogin behaves as if the correct password were entered. sulogin will be connected to the current terminal, or to the optional device that can be specified on the command line (typically /dev/con- sole). If the -t option is used then the program only waits the given number of seconds for user input. If the -p option is used then the single-user shell is invoked with a dash as the first character in argv[0]. This causes the shell process 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. 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. This is very valuable together with the -b option to init. To boot the system into single user mode, with the root file system mounted read/write, using a special "fail safe" shell that is statically linked (this example is valid for the LILO bootprompt) boot: linux -b rw sushell=/sbin/sash FALLBACK METHODS
sulogin checks the root password using the standard method (getpwnam) first. Then, if the -e option was specified, sulogin examines these files directly to find the root password: /etc/passwd, /etc/shadow (if present) If they are damaged or nonexistent, 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. AUTHOR
Miquel van Smoorenburg <miquels@cistron.nl> SEE ALSO
init(8), inittab(5). 17 Jan 2006 SULOGIN(8)
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