查看某端口是否被占用

$ netstat -an | grep <端口号>

如：查看当前 8080 端口是否被占用：

$ netstat -an | grep 8080

查看某端口被哪个程序占用

$ lsof -i:<端口号>

如：查看当前 8080 端口被何程序占用：

$ lsof -i:8080

根据 PID （进程 ID）杀死指定进程，PID 可在执行 lsof -i:<端口号> 的 COMMAND 中列出。

$ sudo kill -9 <PID>

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