title: MAVEN_HOME, MVN_HOME or M2_HOME
body: <p>What's the correct Maven environment variable name: <code>MAVEN_HOME</code>, <code>MVN_HOME</code> or <code>M2_HOME</code>?  </p>
  
  <p>I've found some details about <code>MAVEN_HOME</code> and <code>M2_HOME</code> <a href="https://stackoverflow.com/questions/17136324/what-is-the-difference-between-m2-home-and-maven-home">here</a>. But I also have seen <code>MVN_HOME</code> around.</p>