How to start automatically a script after that the knoppix user is logged on.

[Marietto]

I copied script.sh inside /etc/

#!/bin/sh

clear
read -p "Insert your Windows installation disk and press a key to continue" disco
sudo mount -t auto /dev/cdrom /mnt/cdrom
dosemu

I call it inside the /etc/rc.local file :

rc.local

....
/etc/script.sh

I made it executable,with chmod +x script.sh

and at the end I re-booted Knoppix with runlevel 2,but when it has finished to be loaded in memory,the script.sh is not started.

[mecho]

Since you made it executable it is better to remove the .sh extension and place your script in /usr/sbin, then make a line in /etc/rc.local
Make sure again it is chmod 755

rc.local is the last script executed at every runlevel 2,3,4 and 5