One thing I do fairly often is export songs from iTunes on to USB Flash Disk; mainly because my car has an internal hard drive and I want to update my song list. Unfortunately, when you drag songs out of iTunes into a Finder folder, each filename has the track number appended to it at the beginning. Example, all files are named like below (please don’t judge the song selection!):

You can edit these manually, but here’s a quick trick using Terminal.

1. Open Terminal
2. Change your directory to the folder containing music, i.e.
   cd Desktop/Music/Roy
3. Check if you’re in the right folder using the ls command.
4. In my case, I want to trim the first 3 characters, so I use the following command:
   for f in *;do mv “$f” “${f:3}”;done
5. Check the files again using ls command

And voila, you’re done! In case you want to cut out more characters, change the number “3”, to the value of your choice.