mvn命令无法在mac OS X Yosmeti上运行

export PATH=$M2:$PATH应该是export PATH=$M2/bin:$PATH或export PATH=$M2_HOME/bin:$PATH

JAVA_HOME也应该是这样的

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_60

然后

export PATH=$JAVA_HOME/bin:$PATH

就这样.

一体

export M2_HOME=/usr/local/apache-maven/apache-maven-3.3.9
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_60
export PATH=$JAVA_HOME/bin:$M2_HOME/bin:$PATH