Activation and Definition of shell script that changes Java SDK to be Sun JDK if it is OpenJSK

java-sdk-version-changer.sh

# To be put in /etc/rc.d/rc.local
bash /home/ec2-user/misc/java-version-changer.sh >> /home/ec2-user/misc/java-change.log 2>&1

# Contents of java-version-changer.sh that detects if openJDK is installed, if true first it will
# install sun jdl & then set it as the default Java SDK
dd="`date +%Y_%m_%d__%H_%M_%S`"
if [ `ls -l /etc/alternatives/java | grep openjdk | wc -l` -eq 1 ]; then
  echo "$dd - Open JDK" 
  sudo /usr/sbin/alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_01/bin/java 20000
  sudo /usr/sbin/alternatives --set java /usr/java/jdk1.7.0_01/bin/java
  echo "$dd - Changed to Sun JDK" 
else
 echo "$dd - Sun JDK"
fi