Mac下mvn -v提示Permission denied

装完maven后查看maven版本

mvn -v 

提示

-bash: /opt/apache-maven-3.2.2/bin/mvn: Permission denied

权限不够，chmod a+x  /opt/apache-maven-3.2.2/bin/mvn(a:所有用户 +:增加权限 x:执行权限)