怎么用命令查看linux上本机的某个端口是否被占用

linux系统下，查看端口占用情况的命令：lsof -i 1 [root@www ~]# lsof -i 2 3 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME 4 nginx 2333 root 6u IPv4 6242 TCP *:http (LISTEN) 5 nginx 2334 www 6u IPv4 6242 TCP *:http (LISTEN) 6 sshd 2349 root 3u IPv6 6283 TCP