Script to change Java JDK in OSX. Only tested on Mountain Lion, other versions should use the Java Preferences app.

change-java

#!/bin/bash

TXTBLD=$(tput bold)
TXTRST=$(tput sgr0)

JVMS="/System/Library/Java/JavaVirtualMachines"
JAVA7="jdk1.7.0_17.jdk"
JDKS="~/.jdks"

usage () {
    echo "Usage: `basename $0` {6|7}" 1>&2
    echo -e "\n"
    echo "$TXTBOLD Warning: $TXTRST Expects JDK1.7 to be found in $JDKS/$JAVA7"
    echo -e "\n"
    exit 0
}

if [ $# -lt 1 ]
then
    usage
fi

case "$1" in

6)  echo "Setting Java to version 6…"
    sudo rm -rf "$JVMS/$JAVA7"
    exit $?
    ;;
7)  echo "Setting Java to version 7…"
    sudo cp -r $JDKS/$JAVA7 $JVMS
    exit $?
    ;;
*)  usage
    ;;

esac