rename or prename is Perl tool can rename multiple files using regular expression.
For example to rename .mp3 files to 0.mp3
rename -v 's/(\d
Unknown macro: {2}
).mp3/0$1.mp3/' ??.mp3
-v, --verbose
-n, --no-act
Usually you should use -n and -v option to test your expression first, after you make sure it works as you expected, remove the -n option to do the real job.