(Bash) Minecraft Multi Launcher

minecraft.sh

#!/bin/bash

export LD_LIBRARY_PATH=/usr/lib/jvm/java-7-oracle/jre/lib/amd64
# /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64

export OPT1="Start Minecraft Launcher"
export OPT2="Start Technic Launcher"
export OPT3="Start Magic Launcher"
export OPT4="Quit"

export MEMOPT="-Xmx2G -Xms1G"

select CHOICE in "$OPT1" "$OPT2" "$OPT3" "$OPT4"
do
  case "$CHOICE" in
    $OPT1)
      java $MEMOPT -cp ~/minecraft.jar net.minecraft.LauncherFrame
      ;;
    $OPT2)
      java $MEMOPT -cp ~/technic.jar org.spoutcraft.launcher.Main
      ;;
    $OPT3)
      # java -jar ~/magic.jar -> jar xf ~/magic.jar -> MANIFEST.MF -> main class
      java $MEMOPT -cp ~/magic.jar magic.launcher.MagicLauncher
      ;;
    *)
      exit
      ;;
  esac
  exit
done