使用 which <命令> 查看

    1. $ which git
    2. /usr/local/bin/git
    4. $ which node
    5. /usr/local/bin/node
    7. $ which npm
    8. /usr/local/bin/npm
    10. $ which python
    11. /usr/bin/python
    13. $ which python3
    14. /usr/local/bin/python3