Tiny Minecraft setup script

mc.sh

#!/bin/bash
#
# mc.sh - Tiny Minecraft setup script
#
# Copyright (C) 2012 Brandon DeRosier
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#

if [ "$1" == "get" ]; then
    mkdir -p ~/minecraft/client/
    mkdir ~/minecraft/server/

    wget https://s3.amazonaws.com/MinecraftDownload/launcher/minecraft.jar
    mv minecraft.jar ~/minecraft/client/
    touch ~/minecraft/client/run.sh
    echo "java -Xmx1024M -Xms512M -cp minecraft.jar net.minecraft.LauncherFrame" > ~/minecraft/client/run.sh
    chmod +x ~/minecraft/client/run.sh

    wget https://s3.amazonaws.com/MinecraftDownload/launcher/minecraft_server.jar
    mv minecraft_server.jar ~/minecraft/server/
    touch ~/minecraft/server/run.sh
    echo "java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui" > ~/minecraft/server/run.sh
    chmod +x ~/minecraft/server/run.sh
elif [ "$1" == "patch" ]; then
    mkdir -p ~/minecraft/tmp/

    wget http://www.newdawnsoftware.com/jenkins/view/LWJGL/job/LWJGL/lastSuccessfulBuild/artifact/dist/lwjgl-2.8.5.zip
    mv lwjgl-2.8.5.zip ~/minecraft/tmp/
    unzip ~/minecraft/tmp/lwjgl-2.8.5.zip -d ~/minecraft/tmp/
    mv ~/minecraft/tmp/lwjgl-2.8.5/ ~/minecraft/tmp/lwjgl/

    mkdir -p ~/.minecraft/bin/

    mv ~/.minecraft/bin/lwjgl.jar ~/.minecraft/bin/lwjgl.jar.bak
    cp ~/minecraft/tmp/lwjgl/jar/lwjgl.jar ~/.minecraft/bin/

    mv ~/.minecraft/bin/lwjgl_util.jar ~/.minecraft/bin/lwjgl_util.jar.bak
    cp ~/minecraft/tmp/lwjgl/jar/lwjgl_util.jar ~/.minecraft/bin/

    mv ~/.minecraft/bin/jinput.jar ~/.minecraft/bin/jinput.jar.bak
    cp ~/minecraft/tmp/lwjgl/jar/jinput.jar ~/.minecraft/bin/

    if [ -d "~/.minecraft/bin/natives/" ]; then
	mv ~/.minecraft/bin/natives/ ~/.minecraft/bin/natives.bak/
    fi
    mkdir ~/.minecraft/bin/natives/
    cp ~/minecraft/tmp/lwjgl/native/linux/* ~/.minecraft/bin/natives/
elif [ "$1" == "run" ]; then
    java -Xmx1024M -Xms512M -cp ~/minecraft/client/minecraft.jar net.minecraft.LauncherFrame
elif [ "$1" == "runserver" ]; then
    java -Xmx1024M -Xms1024M -jar ~/minecraft/server/minecraft_server.jar nogui
elif [ "$1" == "removeall" ]; then
    rm -r ~/.minecraft/
    rm -r ~/minecraft/
else
    echo "Tiny Minecraft setup script -- github.com/CheeseKeg/"
    echo " - Directions: 1. Run \"./mc.sh get\" (without quotes)"
    echo "               2. Run Minecraft using \"./mc.sh run\" (without quotes)"
    echo "               3. Login to Minecraft and update (to experience a black screen)"
    echo "               4. Run \"./mc.sh patch\" (without quotes)"
    echo "               5. Minecraft should now (hopefully) work -- run Minecraft using \"./mc.sh\""
    echo "              (6.)You can also run a local Minecraft server using \"./mc.sh runserver\" (without quotes)"
    echo " - Usage: ./installminecraft.sh [FUNCTION]"
    echo " - FUNCTIONs:"
    echo "       get       -- Create directories and download Minecraft"
    echo "       patch     -- Download and replace bad LWJGL files"
    echo "       run       -- Run the Minecraft client"
    echo "       runserver -- Run a Minecraft server"
    echo "       removeall -- Removes all Minecraft data and the ~/minecraft directory"
fi

exit 0