Maven Installation

OS：Ubuntu 14.04

1. Extract the distribution archive, i.e. apache-maven-3.2.2-bin.tar.gz to the directory you wish to install Maven 3.2.2. These instructions assume you chose /usr/local/apache-maven. The subdirectory apache-maven-3.2.2 will be created from the archive.
2. In a command terminal, add the M2_HOME environment variable, e.g. export M2_HOME=/usr/local/apache-maven/apache-maven-3.2.2.
3. Add the M2 environment variable, e.g. export M2=$M2_HOME/bin.
4. Optional: Add the MAVEN_OPTS environment variable to specify JVM properties, e.g. export MAVEN_OPTS="-Xms256m -Xmx512m". This environment variable can be used to supply extra options to Maven.
5. Add M2 environment variable to your path, e.g. export PATH=$M2:$PATH.
6. Make sure that JAVA_HOME is set to the location of your JDK, e.g. export JAVA_HOME=/usr/java/jdk1.7.0_51 and that $JAVA_HOME/bin is in your PATH environment variable.
7. Run mvn --version to verify that it is correctly installed.

About the environment：I put it in the file .bashrc

        1. sudo gedit/vim ~/.bashrc

        2. export M2_HOME=/usr/local/software/apache-maven-3.2.2/
            export M2=$M2_HOME/bin
            export MAVEN_OPTS="-Xms256m -Xmx512m"
            export PATH=$M2:$PATH

        3. restart the terminal

        4. mvn --version       

Apache Maven 3.2.2 (45f7c06d68e745d05611f7fd14efb6594181933e; 2014-06-17T21:51:42+08:00)
Maven home: /usr/local/software/apache-maven-3.2.2
Java version: 1.7.0_55, vendor: Oracle Corporation
Java home: /usr/local/software/jdk1.7.0_55/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-30-generic", arch: "amd64", family: "unix"
alexstuart@alexstuart:~$ sudo gedit ~/.bashrc