how can you get music from your ipod for free

hi guys i want to get all the old music from my ipod onto my mac however there are loads of software that says it free then charges is there a way built into the mac system that alows me to do this like in terminal etc? i have mountain lion and am aware you can use terminal to show all files on previous versions but cant find out how to do it on the new software.

Cheers

Jim