WMA to MP3 Script for Linux

I ran into a Rap artist who has his files as *.wma files for download.
So I created a bash/zenity script to convert those files to *.mp3s

#!/bin/bash
choice="`zenity --file-selection --directory --title="Select the  directory with your wma files"`"
artist="`zenity --entry --title="Artist Name" --text="Enter Artist Name"`"
genre="`zenity --entry --title="Genre" --text="Enter Genre" --entry-text="Rap"`"
album="`zenity --entry --title="Album Name" --text="Enter Album Name"`"
year="$(zenity --entry --title="Album Year" --text="Enter Album Year" --entry-text="`date +%Y`")"


        case $? in
                 0)
            cd "$choice"
            if [ $PWD = "$choice" ]; then
              if [ ! -d 'workdir' ]; then
              mkdir workdir
              fi
              if [ ! -d 'mp3s' ]; then
                  mkdir mp3s
              fi
              if [ ! -d 'wavs' ]; then
            mkdir wavs
              fi
  zenity --info --text="This will take some time. Please be patient."

for file in *.wma  
do cp "$file" ./workdir/`echo $file | sed -e 's/  */_/g' -e 's/[-]/_/g' -e 's/[.][.]//'`
done
 
cd workdir 
for j in *.wma 
do  mplayer -quiet -vo null -vc dummy -af resample=44100 -ao pcm:waveheader:file=../wavs/`basename $j .wma`.wav $j &> /dev/null
done
for k in ../wavs/*.wav
do lame -b 192 $k ../mp3s/`basename $k .wav`.mp3 2>&1 | (zenity --progress --auto-close --pulsate --percentage=0 --text=`basename $k .wav`)
done 
              curdir=`basename $PWD`
              if [ $curdir = 'workdir' ]; then
            
              cd ../
              count=`ls -1 mp3s/*mp3|wc -l` 
              #rm -fR workdir
              #rm -fR wavs
              cd mp3s
for l in *.mp3;do mp3info -a "$artist" -g "$genre" -l "$album" -y "$year" -n "$(echo $l|awk -F'_' '{print $1}')" -t "$(echo $l|sed -e 's/.._//' -e 's/.mp3//g' -e 's/[_]/ /g')" $l ;done
             zenity --info --text=$count" files converted"

              fi
  
cd
          fi
            
              
            ;;
                 1)
            zenity --error --text "No Directory Selected"
            ;;
                -1)
            zenity --error --text "No Directory Selected"
            ;;
        esac
      

Needed packages:

• zenity
• mplayer (with windows codecs/etc)
• lame
• mp3info