1,举例说明mtr命令安装

brew install mtr

2,运行mtr报错

$ mtr
-bash: mtr: command not found

3,原因是安装过程中位置不对，需要手动做软连接

ln -s /usr/local/Cellar/mtr/0.86/sbin/mtr /usr/local/bin/mtr

4,运行mtr，还是报错

$ mtr
mtr: unable to get raw sockets.

5,进行授权操作

cd /usr/local/sbin
sudo chown root mtr
sudo chmod u+s mtr