Install JDK 7 Centos 7

#!/bin/sh
cd /opt
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz"
tar xzf jdk-7u79-linux-i586.tar.gz
cd /opt/jdk1.7.0_79/
alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 2
alternatives --config java
alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 2
alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 2
alternatives --set jar /opt/jdk1.7.0_79/bin/jar
alternatives --set javac /opt/jdk1.7.0_79/bin/javac
cat "export JAVA_HOME=/opt/jdk1.7.0_79" >> /etc/environment
cat "export JRE_HOME=/opt/jdk1.7.0_79/jre" >> /etc/environment
cat "export PATH=$PATH:/opt/jdk1.7.0_79/bin:/opt/jdk1.7.0_79/jre/bin" >> /etc/environment