Easy JVM switcher script for Mac OS X

jdk

#!/bin/bash
if [ ! $1 ]; then
	echo "Please include desired jdk version:  1.7 or 7, 1.6 or 6, ..."
	exit
fi

j7="/Library/Java/JavaVirtualMachines/jdk1.7.0_17.jdk/Contents/Home"
#j6="/Library/Java/JavaVirtualMachines/1.6.0_45-b06-451.jdk/Contents/Home"
j6="/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home"

case $1 in
	"1.7" | "7") export JAVA_HOME=$j7 ;;
	"1.6" | "6") export JAVA_HOME=$j6 ;;
	*)
		echo "Supported versions are 1.6, 6, 1.7, or 7"
		exit
		;;
esac

# scrub path of any JAVA_HOMEs
for j in "$j7" "$j6"
do
	PATH=`echo $PATH | sed s,"$j/bin",,g`
done

if [ "$2" == "all" ]; then
	# replace for entire machine by replacing symlink
	rm ~/.java
	ln -s $JAVA_HOME ~/.java
else
	# replace for just this shell by prepending java to scrubbed path
	export PATH=$JAVA_HOME/bin:$PATH
fi