Shell Programming and Scripting

#! /bin/bash

rename_seq ()
{
  seq=1
  oldname="$1"
  newname="$2"
  ext="$3"
  while [ -e "$newname$(printf "%02d" $seq).$ext" ]; do
    (( seq ++ ))
  done
  mv "$oldname.mp3" "$newname$(printf "%02d" $seq).mp3"
}

ls | while read name; do
  ext="${name##*.}"
  name="${name%.*}"
  newname="${name//[[:punct:]]/_}"
  newname="${newname:0:38}"
  if [ -e "${newname}.mp3" ]; then
    rename_seq "$newname" "$newname" "mp3"
  fi
  if [ -e "${newname}"??".$ext" ]; then
    rename_seq "$name" "$newname" "mp3"
  else
    mv "$name.mp3" "$newname.mp3"
  fi
done

BASE=/home/music/ARTIST_NAME/ALBUM
cd $BASE

marco@marco-desktop:~/Music$ ./both.sh
./both.sh: line 2: i: command not found
./both.sh: line 19: cd: /home/marco/Music/ARTIST_NAME/ALBUM: No such file or directory
mv: cannot stat `just_files.sh/just_files.mp3': No such file or directory
mv: cannot stat `just_files.sh/just_files.mp3': No such file or directory
mv: cannot stat `B_52_s_ The _ Rock Lobster99999999999999999999999999999999.mp3/B_52_s_ The _ Rock Lobster99999999999999999999999999999999.mp3': No such file or directory
mv: cannot stat `B_52_s_ The _ Rock Lobster999999999999999999999999999999.mp3/B_52_s_ The _ Rock Lobster999999999999999999999999999999.mp3': No such file or directory
mv: cannot stat `Folder.jpg/Folder.mp3': No such file or directory
mv: accessing `both.sh/both.mp3': Not a directory
mv: accessing `both.sh~/both.mp3': Not a directory
mv: cannot stat `Dname': No such file or directory
mv: cannot stat `Dname': No such file or directory
mv: cannot stat `Dname': No such file or directory
marco@marco-desktop:~/Music$