Here is a small plugin for shell scripts on the box is to start.
This plugin can be for example be placed with the multi-Quick button on a button.
In the file / usr/lib/enigma2/python/Plugins/Extension/ShExec/userscript.sh what is set to be executed.
This file must be edited with a Linux compatible editor and have the rights 755th
I use this plugin to start by pressing a key on my Media Server WakeOnLan.
One could thus for example a screenshot can be created by pressing a key.
In the directory examples two scripts are included (WakeOnLan and Screenshot) as examples.
copy via FTP to / tmp on the box.
With telnet login on the box.
ipkg install enigma2-plugin-extensions-shexec_0.1_all.ipk