Is there a way or a tweak to make Siri execute shell commands Indeed I have a home automation system, I would like to integrate a voice control system and for that I need to be able to call shell commands like curl. 

I have seen many Siri tweaks but none of them allowing to assign a voice command like :
turn on the light
To a specific shell command
Ok I got it working with the awesome tweak Assistant+. 
You just need to set the voice command you wan't to say, and then you can type the shell command to execute. 

It costs 1.99$ on cydia