linux怎样查看网络端口号

netstat -tuln

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp6       0      0 :::80                   :::*                    LISTEN     
udp        0      0 0.0.0.0:123             0.0.0.0:*                          

ss -tuln

State      Recv-Q Send-Q        Local Address:Port          Peer Address:Port
LISTEN     0      128                      *:22                       *:*
LISTEN     0      128                      *:80                       *:*

lsof -i -P -n | grep LISTEN

sshd      1234     root    3u  IPv4  12345      0t0  TCP *:22 (LISTEN)
nginx     5678   www-data    6u  IPv4  23456      0t0  TCP *:80 (LISTEN)

fuser -n tcp 80

80/tcp:            5678

sudo lsof -i :<端口号>
sudo kill -9 <PID>

sudo netstat -tuln
sudo ss -tuln
sudo lsof -i -P -n