输入: ? ~ mvn
提示: zsh: command not found: mvn
解决方法: step 1:
vim ~/.zshrc
step 2:(Add at the end of the file)
source ~/.bash_profile;
step 3:(Execution shell)
> source ~/.bash_profile
zsh: command not found: mvn
原文：https://www.cnblogs.com/guofuangela/p/14551951.html
