VERY simple Bash launcher for Minecraft client

minecraft.sh

#!/bin/bash
# MIIIINECRAFT!!! (No authentication :p)

# Configuration section:
mc_dl_path="https://s3.amazonaws.com/MinecraftDownload/" #where all minecraft downloads are
lwjgl_version="2.8.1"   #which version of LWJGL you wish to update to by default
cmd_get="wget"          #what command you use to GET files
HOME="."                #path where you want .minecraft
cd

# Ensure we have a .minecraft AND .minecraft/bin AND .minecraft/bin/natives folder
[ ! -d .minecraft/bin/natives ] && mkdir -p .minecraft/bin/natives

# Update LWJGL code. (WIP)
update_lwjgl() {
	[ "$1" ] && lwjgl_version="$1"
	cd .minecraft/bin
	if [ "$lwjgl_version" = "mc" ]
	then #download the vanilla Minecraft version
		eval $cmd_get "${mc_dl_path}jinput.jar" "${mc_dl_path}lwjgl.jar" "${mc_dl_path}lwjgl_util.jar" "${mc_dl_path}linux_natives.jar.lzma" "${mc_dl_path}macosx_natives.jar.lzma" "${mc_dl_path}windows_natives.jar.lzma"
		cd natives
		xz ../*.lzma
		unzip *.jar
		return
	fi
	eval $cmd_get -O lwjgl.zip "http://downloads.sourceforge.net/project/java-game-lib/Official%20Releases/LWJGL%20${lwjgl_version}/lwjgl-${lwjgl_version}.zip"
	# need to extract relevant files into relevant directories
	unzip "lwjgl-${lwjgl_version}.zip"
}

# Update everything!
if [ "$1" = "update" ]
then
	cd .minecraft/bin
	eval $cmd_get "${mc_dl_path}minecraft.jar"
	update_lwjgl "$2"
	exit
fi

# Update Minecraft only.
if [ "$1" = "update-mc" ]
then
	cd .minecraft/bin
	eval $cmd_get "${mc_dl_path}minecraft.jar"
	exit
fi

# Update LWJGL only.
if [ "$1" = "update-lwjgl" ]
then
	update_lwjgl "$2"
	exit
fi

echo -n 'Username: '
read mcname
stty -echo
echo -n 'Password: '
read mcpass
stty echo
java -Xms512m -Xmx1024m -cp ".minecraft/bin/*" -Djava.library.path='.minecraft/bin/natives' net.minecraft.client.Minecraft "$mcname" "$mcpass"

hello

ilfilk

u