总是对linux及mac下环境变量设置不熟悉，故把maven的环境配置贴到博客做个备忘

Unix-based Operating Systems (Linux, Solaris and Mac OS X)

1. Extract the distribution archive, i.e.?apache-maven-3.0.3-bin.tar.gz?to the directory you wish to install Maven 3.0.3. These instructions assume you chose?/usr/local/apache-maven. The subdirectory?apache-maven-3.0.3?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-3.0.3.
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:$PATH.
6. Make sure that?JAVA_HOME?is set to the location of your JDK, e.g.?export JAVA_HOME=/usr/java/jdk1.5.0_02?and that?$JAVA_HOME/bin?is in your?PATH?environment variable.
7. Run?mvn --version?to verify that it is correctly installed.

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