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My old notebook Fujitsu-Siemens Lifebook S7010 drove an Intel graphics card whose driver wasn’t able to detect the plugging of external monitors. So I wrote a little script to switch my xorg.conf file:

#!/bin/sh
if diff /etc/X11/xorg.conf /etc/X11/xorg.conf.single >/dev/null 2>&1
then
sudo cp /etc/X11/xorg.conf.dual /etc/X11/xorg.conf
echo 'monitor: dual'
else
sudo cp /etc/X11/xorg.conf.single /etc/X11/xorg.conf
echo 'monitor: single'
fi

It is also possible to switch between different network configurations. The reason for me was that I was able to use LAN in the office and use WLAN at home. Just append this to your changeConfiguration.sh:

if diff /etc/network/interfaces /etc/network/interfaces.home >/dev/null 2>&1
then
sudo ifdown eth0
sudo ifdown eth1
sudo cp /etc/network/interfaces.office /etc/network/interfaces
sudo ifup eth0
sudo cp /etc/resolv.conf.office /etc/resolv.conf
echo 'network: office'
else
sudo ifdown eth0
sudo ifdown eth1
sudo cp /etc/network/interfaces.home /etc/network/interfaces
sudo ifup eth1
sudo cp /etc/resolv.conf.home /etc/resolv.conf
echo 'network: home'
fi

Now, how does this work? First, create configuration files for each setup in the appropriate folders. In the first example it is /etc/X11/xorg.conf.single and /etc/X11/xorg.conf.dual, in the second example it is /etc/network/interfaces.office, /etc/network/interfaces.home, /etc/resolv.conf.home and /etc/resolv.conf.office. Put your configuration into these files.
This is no catch-it-all-script, you have to switch to another terminal screen (e.g. Ctrl + Alt + F2) and call the script: sh changeConfiguration.sh. It will tell you if you are driving single- or dual-screen and which network configuration you’ll use. Restart your X-server after calling.