Installing Oracle Java8 on CentOS/RHEL

Step 1: Download JAVA Archive

Download latest Java SE Development Kit 8 release from its download page.

# 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/8u5-b13/jdk-8u5-linux-i586.tar.gz"
Note: If Above wget command doesn’t not worked for you watch this screencast to download JDK from terminal.

Now extract downloaded archive file

# tar xzf jdk-8u5-linux-i586.tar.gz
Step 2: Install JAVA using Alternatives

After extracting archive file use alternatives command to install it. alternatives command is available in chkconfig package.

# cd /opt/jdk1.8.0_05/
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_05/bin/java 2
# alternatives --config java


There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /opt/jdk1.8.0/bin/java
 + 2           /opt/jdk1.7.0_55/bin/java
   3           /opt/jdk1.8.0_05/bin/java

Enter to keep the current selection[+], or type selection number: 3

At this point JAVA 8 has been successfully installed on your system.

Step 3: Check Version of JAVA .

Check the installed version of java using following command.

# java -version

java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) Client VM (build 25.5-b02, mixed mode)

Step 4: Setup Environment Variables

Most of java based application’s uses environment variables to work. Set the java environment variables using following commands

Setup JAVA_HOME Variable
# export JAVA_HOME=/opt/jdk1.8.0_05
Setup JRE_HOME Variable
# export JRE_HOME=/opt/jdk1.8.0_05/jre
Setup PATH Variable
# export PATH=$PATH:/opt/jdk1.8.0_05/bin:/opt/jdk1.8.0_05/jre/bin

Installation of Oracle Java 8 (JDK8 and JRE8) in Ubuntu / Linux Mint

Applies to:
Ubuntu 14.04 LTS, 13.10, 12.10, 12.04 LTS and 10.04 and LinuxMint systems using PPA File. To Install Java 8 in CentOS, Redhat and Fedora read This Article.

Step 1: Install Java 8 (JDK 8)

Add the webupd8team java PPA repository in our system and install Oracle java8 using following set of commands.

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer

Step 2: Verify JAVA Version

After successfully installing oracle java using above step verify installed version using following command.

$ java -version

java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) Client VM (build 25.5-b02, mixed mode)
Step 3: Setup JAVA Environment

Webupd8team is providing a package to set environment variables, Install this package using following command.

$ sudo apt-get install oracle-java8-set-default

References:
https://launchpad.net/~webupd8team/+archive/java

Nodejs on Ubuntu 12.04

Obtaining a recent version of Node or installing on older Ubuntu and other apt-based distributions may require a few extra steps. Example install:
sudo apt-get update
sudo apt-get install -y python-software-properties python g++ make
sudo add-apt-repository -y ppa:chris-lea/node.js
sudo apt-get update

sudo apt-get install nodejs

Check the node version:

node --version

Installation with Forever:

cd /usr/lib/node_modules

sudo npm install forever -g

npm http GET https://registry.npmjs.org/forever
npm http 200 https://registry.npmjs.org/forever
npm http GET https://registry.npmjs.org/forever/-/forever-0.10.11.tgz
npm http 200 https://registry.npmjs.org/forever/-/forever-0.10.11.tgz
npm http GET https://registry.npmjs.org/flatiron
npm http GET https://registry.npmjs.org/forever-monitor/1.2.3
npm http GET https://registry.npmjs.org/nconf
npm http GET https://registry.npmjs.org/nssocket

.