Navigate the GUI with your browser to Configuration -> DVB Inputs -> Muxes and find the multiplex you want to record. Right-click on the 'Play' icon on the left-hand side of the screen and select 'Copy Link'. Open a terminal window on your machine and type 'wget ', paste the URL you just copied then press return. Hit control-C when you have enough data.
Note that the URL you have copied is only valid for five minutes.
