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Using Linux Debian Lenny without graphic mode

Posted on 2008-10-07
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Last Modified: 2013-12-15
Dear experts,

I have Linux debian Lenny  running in an AMD geode processor I need work without of graphic mode, it is possible?

Is possible that my username and password they are provided (ej. readed from a file) in order to start automatically ?.

my best regards,

cheers,


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Question by:hernan007
6 Comments
 
LVL 40

Expert Comment

by:omarfarid
ID: 22665679
If you are familiar with linux commands then you may set the system to startup in non-gui mode and then you may set login from a particular terminal device (in linux it is called tty device) with specific user id with no password.

For running console with no gui, change the below line in /etc/inittab

From

id:5:initdefault:

To


id:3:initdefault:

For login with specific user with no password, I need to search for it and come back to you.
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Expert Comment

by:ixti
ID: 22667109
This article at TLDP should help with autologin:
http://www.tldp.org/LDP/LG/issue27/kodis.html
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LVL 34

Expert Comment

by:Duncan Roe
ID: 22667451
By experimenting on my own system, I think I have a solution for you. You need to substitute your user name for mine ("dunc"). This does not require any modifications to existing software, but it does hang on to the virtual console (VC) for ever - if you exit then you get a prompt from a fresh shell.
In /etc/inittab, for each console that you want to log in, put an entry like (for vc 6):

t1:3:respawn:/bin/sh -c "exec /bin/bash 1<>/dev/tty6 2>&1 0<&1 --rcfile /root/t6 -i"

This breaks down as follows:

t1: unique inittab identifier "test 1"
respawn: init will start another process when this one finishes (as I said above, this hangs on to the VC for ever)
/bin/sh -c "exec /bin/bash 1<>/dev/tty6 2>&1 0<&1 --rcfile /root/t6 -i": Start an interactive bash shell opening /dev/tty6 for input and output, set stderr and stdin to also go to /dev/tty6 (VC 6). As it happens, /dev/tty also points there as well. The shell is to initially obey the commands in /root/t6. This leads us on to:

/root/t6 is the file of initial commands that bash should obey:

20:44:10# cat /root/t6
chown dunc /dev/vc/6
exec su - dunc

The first line sets the ownership of the target VC to be owned by the desired eventual user (init starts everything as root). You need to set ownership on /dev/vc/6 and not /dev/tty6, because /dev/tty6 is a symbolic link and chown doesn't follow it for some reason (maybe because the target is a device special file). If you miss out that line it seems to work anyway, but you get a mystery error message "/dev/vc/6: Operation not permitted".
The second line sets the process to be run by the desired user. Because of doing exec, he cannot get back to being root by doing an exit. Because of "su -" and not just "su", the target user goes through a complete login sequence, reading .bash_profile etc.

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Author Comment

by:hernan007
ID: 22672721
Hi thanks,  

in my /etc/inittab I have

id:2initdefault


where in runlevel is

0 is halt
1 is single user
2-5  are multi-user
6 is reboot

for multi-user are 2-5 ..what is the difference?  

on the other hand, I need use administrative services  with c++ for sample I need use the date function
but I have problems because I need use "su" or "sudo" , I dont know how I can use it

system ("su mypassword");  
system ("date mydate");

but its not work ...

thanks thanks
0
 

Author Comment

by:hernan007
ID: 22672895
Thanks omarfarid,

but your suggestion is the same for    

id:5initdefault   to  change to  id:3initdefault


:(  
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LVL 34

Accepted Solution

by:
Duncan Roe earned 500 total points
ID: 22673531
There may be no difference from 2 to 5, or maybe only level 2 is configured properly. Distributions vary a lot in what they do and I'm unfamiliar with yours. If it's at 2, just leave it there and change the line I gave you to:

t1:3:respawn:/bin/sh -c "exec /bin/bash 1<>/dev/tty6 2>&1 0<&1 --rcfile /root/t6 -i"

At the same time, you also need to ensure that init no longer starts a getty on that tty - I forgot to mention that before. Look for a line like

c6:12345:respawn:/sbin/agetty 38400 tty6 linux

and change it to

c6:1345:respawn:/sbin/agetty 38400 tty6 linux

(i.e. don't start a getty in runlevel 2).

The explanatory breakdown was missing  an important line too - it should have started:

t1: unique inittab identifier "test 1"
3: Do this action in runlevel 3 (and no other levels)
respawn: init will start another process when this one finishes (as I said above, this hangs on to the VC for ever)
(and so on as before)

Your c++ problems with trying to use system() are another problem altogether - please raise a new question in the Linux Programming topic area for that.
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