Installing Sun-Java JDK Using Bash Script :: Ubuntu

Getting Started

We are going to write simple bash script and execute it to install Sun Java. We will write content to text file using any of your favorite test editor. give it permission to execute and enjoy. hope it  works without error, else let me know issue to update it, it works fine for me on 2 different machines running Linux mint 17 and Ubuntu 14.04 respectively.

What is Bash?

Descended from the Bourne Shell, Bash is a GNU product, the "Bourne Again SHell." It's the standard command line interface on most Linux machines. It excels at interactivity, supporting command line editing, completion, and recall. It also supports configurable prompts - most people realize this, but don't know how much can be done.

Writing Script:

To write script for installation open new file named install_java.sh and put following content in it.

#!/bin/bash

# Script to install Sun Java

clear

# This command is used to tell shell, turn installation mode to non interactive
# and set auto selection of agreement for Sun Java
export DEBIAN_FRONTEND=noninteractive
echo debconf shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections
echo debconf shared/accepted-oracle-license-v1-1 seen true | sudo debconf-set-selections


echo "Bash Script for Installing Sun Java for Ubuntu!"

echo "Now Script will try to purge OpenJdk if installed..."

# purge openjdk if installed to remove conflict
sudo apt-get purge openjdk-\* -y

echo "Now we will update repository..."

sudo apt-get update -y

echo "Adding Java Repository...."

sudo apt-get install python-software-properties -y
sudo add-apt-repository ppa:webupd8team/java -y

echo "Updating Repository to load java repository"

sudo apt-get update -y

echo "Installing Sun Java....."
sudo -E apt-get purge oracle-java7-installer -y
sudo -E apt-get install oracle-java7-installer -y

echo "Installation completed...."

echo "Installed java version is...."

java -version
   

Now we will give it permission to make it executable.

 ~$ chmod 755 install_java.sh

Now we can execute script using following command, Since installation require root excess and use sudo, script may prompt to ask password. provide password to initiate installation process.

 ~$ ./install_java.sh  

Enjoy.

Installing Sun-Java JDK 7

Install Java JDK OS- MINT15, will work on on all Debian Based systems including ubuntu Easy Way: Simple and easy way to install JDK is to do it with apt-get repository. but noted that this some ti PPA becomes out dated.  This installs JDK 7 (which includes Java JDK, JRE and the Java browser plugin). Remove any installed version of open-JDK $ sudo apt-get purge openjdk-\* Add PPA and update apt-get repo $ sudo apt-get update $ sudo apt-get install python-software-properties $ sudo add-apt-repository ppa:webupd8team/java $ sudo apt-get update install it $ sudo apt-get install oracle-java7-installer Check version and process id Check your Java version to ensure installations and settings: $ java -version Verify that JPS (JVM Process Status tool) is up and running $ jps Manual way: 1) Remove any previous OpenJDK installations $ sudo apt-get purge openjdk-\* 2) Make directory to hold Sun Java $ sudo mkdir -p /usr/local/java 3) Download Oracle Java Sun (JDK/JRE) from Oracle’s website: JDK Download and JRE Download. Normally downloaded files will be placed in /home/<your_user_name>/Downloads folder. 4) Copy the downloaded files to the Java directory $ cd /home/<your_user_name>/Downloads $ sudo cp -r jdk-7u51-linux-x64.tar.gz /usr/local/java $ sudo cp -r jre-7u51-linux-x64.tar.gz /usr/local/java 5) Unpack the compressed binaries $ cd /usr/local/java $ sudo tar xvzf jdk-7u51-linux-x64.tar.gz $ sudo tar xvzf jre-7u51-linux-x64.tar.gz 6) Cross-check the extracted binaries: $ ls -a The following two folders should be created: jdk1.7.0_51 and jre1.7.0_51 7) To provide information about JDK/JRE paths to the system PATH (located in /etc/profile), first access the PATH: $sudo nano /etc/profile and add the following lines at the end: JAVA_HOME=/usr/local/java/jdk1.7.0_51 PATH=$PATH:$HOME/bin:$JAVA_HOME/bin JRE_HOME=/usr/local/java/jre1.7.0_51 PATH=$PATH:$HOME/bin:$JRE_HOME/bin export JAVA_HOME export JRE_HOME export PATH Save and exit (CTRL+O then Enter, then press CTRL+X then Enter) 8) Inform OS about Oracle Sun Java location to signal that it is ready for use: JDK is available: $ sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.7.0_51/bin/javac" 1 JRE is available: $ sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0_51/bin/java" 1 Java Web Start is available: $ sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jre1.7.0_51/bin/javaws" 1 9) Make Oracle Sun JDK/JRE the default on your system: Set JRE: $ sudo update-alternatives --set java /usr/local/java/jre1.7.0_51/bin/java Set javac Compiler: $ sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_51/bin/javac Set Java Web Start: $ sudo update-alternatives --set javaws /usr/local/java/jre1.7.0_51/bin/javaws 10) Re-load the /etc/profile $ source /etc/profile 11) Check your Java version to ensure installations and settings: $ java -version 12) Verify that JPS (JVM Process Status tool) is up and running $ jps This will show the process id of the jps process