topic Re: running dtach on tty1 automatically after reboot... in Operating System - Linux

running dtach on tty1 automatically after reboot...

bong_3 — Fri, 17 Oct 2003 04:51:05 GMT

hi all...
just want to know whether i can run dtach on tty1 automatically? meaning after i reboot the machine, dtach is already running and immediately i can run the application into its main console.

also, after i exit. this dtach process always run...

Re: running dtach on tty1 automatically after reboot...

Alexander Chuzhoy — Fri, 17 Oct 2003 04:57:53 GMT

generally to execute command upon boot edit the file /etc/rc.local and add the commands there.

Re: running dtach on tty1 automatically after reboot...

Jerome Henry — Fri, 17 Oct 2003 06:17:30 GMT

Yes, go to /etc/rc.d/init.d, create a batch that says :
dtach -arguments you want >tty1
And at rc3.d or rc5.d, according on if you use text or graphical boot, add a line looking like
S93batchname, replacing batchname with the name you choose for your batch, and 93 by the highest number you see (if last number is 87, use 88, and so on).

hth

J

Re: running dtach on tty1 automatically after reboot...

Dave Falloon — Fri, 17 Oct 2003 15:33:08 GMT

You may also be able to put dtach in the inittab as the program to run on the tty's? I don't know much about dtach as I have never used it before, but I have some experience changing program that logs users in. Check out your inittab for a line such as this:

1:2345:respawn:/sbin/getty 38400 tty1

you may want to change the program from /sbin/getty to something else, for example a shell script that prints "You can't login here". I did that to my brother when he left his root passwd sticky noted to the bottom of his keyboard :)

If dtach is able to replace getty you could call it directly as long as it behaves in a way that init expects. ie, it dies cleanly :) Here is how init works:

init scans you inittab, sees the line for tty1 and forks a child that just waits for the process to finish and if it found a respawn it will start the process again. You could start any program you want to really.

Just an idea :)

Dave