rename MP3 files, and remove first 4 characters.

rename-mp3.sh

#!/bin/sh

if [[ ! -d $1 ]]; then
	echo "please specific a MP3 directory"
	exit;
fi

SAVEIFS=$IFS
IFS=$( echo -en "\n\b" )   #fix mp3 files contain a space 
for file in $( find $1 -name *.mp3 ); do
  echo $file
  MP3NAME=$( basename $file)
  PATHNAME=$( dirname $file )
  mv $PATHNAME/$MP3NAME $PATHNAME/$( echo $MP3NAME | cut -c 5- )
done
IFS=$SAVEIFS

# rename the mp3 files, like 010-流年.mp3 -> 流年.mp3
# reference: http://www.cyberciti.biz/tips/handling-filenames-with-spaces-in-bash.html