invoking sql in a shell script

Hi all,

I would like to invoke sql to update a table in KoboReader.sqlite on my Kobo.
But, if I am able to write the sql update, tested on a copy of the KoboReader.sqlite on my PC (Windows 8) with the SQLite Manager for firefox, I don't know the way to access this database in shell.

My purpose is to call the shell by a user command in the KoboTweaks plugin.

Can someone guide me to solve my problem ?
Thanks.