Not my work and since you can set it up to import on a certain day and time im not about to try it im not sure why you would want to.
All credit to the Rytec EPG Team
There is a way to start the epgimport from the command line. However it is not straightforward.
First you have to create a custom sources.xml files (like the one listed here - benl.sources.xml) for the package you want t import. Do not use the rytec.sources.xml file because if you use this in the next step everything will be imported, which wlll take forever, or even crash your box.
I placed this file in /etc/epgimport/ but it can be everywhere.