#!/bin/bash #remove spaces for i in *.wma; do mv "$i" `echo $i | tr ' ' '_'`; done #remove uppercase for i in *.[Ww][Mm][Aa]; do mv "$i" `echo $i | tr '[A-Z]' '[a-z]'`; done #convert file names for i in *.wma; do mv "$i" "`basename "$i" .wma`.mp3"; done #rename test1a, test2a, test3a #to t1a, t2a, t3a for i in test*a; do substring1=${i:0:1} substring2=${i:4:1} mv $i $substring1$substring2'a' done;