Script to install Java in Ubuntu 14 and CentOS 7

java-install.sh

#!/bin/bash
# Installing JAVA
# Authored by Filipe Goes
# Tested in Ubuntu Server 14.05
# Tested in CentOS 7.3
set -u

usage()
{
     echo "usage: java-install-sh -u 'JDK download URL' -f 'Foldername to install (ex. jdk1.8.0_121).'"  
}

while getopts u:f: OPCAO; do
     case "${OPCAO}" in
        u) u="${OPTARG}";;
        f) f="${OPTARG}";;
     esac
done

if [ -z ${u+x} ];then
   echo "ERROR: Java URL not found. Aborting."
   exit 1
fi
if [ -z ${f+x} ];then
   echo "ERROR: Java foldername not supplied. Aborting."
   exit 1
fi

JAVA_URL=${u} # http://download.oracle.com/otn-pub/java/jdk/8u121-b13/e9e7ea248e2c4826b92b3f075a80e441/jdk-8u121-linux-x64.tar.gz
JAVA_FOLDERNAME=${f}# jdk1.8.0_121

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root."
   exit 1
fi

echo "Downloading: $JAVA_URL..."
wget -O jdk.tar.gz --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" $JAVA_URL
if [ $? -ne 0 ]; then
  echo "Not possible to download Java."
  exit 1
fi


echo "Installation..."
tar -xvf jdk.tar.gz

echo "Cleaning up..."
rm -f jdk.tar.gz
 
mkdir -p /usr/lib/jvm
mv ./$JAVA_FOLDERNAME /usr/lib/jvm/  
update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/$JAVA_FOLDERNAME/bin/java" 1 
update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/$JAVA_FOLDERNAME/bin/javac" 1
update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/$JAVA_FOLDERNAME/bin/javaws" 1
update-alternatives --install "/usr/bin/keytool" "keytool" "/usr/lib/jvm/$JAVA_FOLDERNAME/jre/bin/keytool" 1
chmod a+x /usr/bin/java
chmod a+x /usr/bin/javac
chmod a+x /usr/bin/javaws
chmod a+x /usr/bin/keytool
chown -R root:root /usr/lib/jvm/$JAVA_FOLDERNAME

echo "Done. Reboot to before installing the container. Run 'update-alternatives --config java' if necessary."