Linux 检查端口是否被占用

使用 netstat

$ sudo netstat -tulnp | grep ':22'
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      963/sshd: /usr/sbin

使用 lsof

$ sudo lsof -i :22
COMMAND    PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
sshd       963 root    3u  IPv4   21816      0t0  TCP *:ssh (LISTEN)
sshd    292636 root    4u  IPv4 3082489      0t0  TCP iZ7xvhevxjvf4dzop816ukZ:ssh->113.140.11.124:55978 (ESTABLISHED)
sshd    292692 xiao    4u  IPv4 3082489      0t0  TCP iZ7xvhevxjvf4dzop816ukZ:ssh->113.140.11.124:55978 (ESTABLISHED)
sshd    292957 root    4u  IPv4 3082136      0t0  TCP iZ7xvhevxjvf4dzop816ukZ:ssh->113.140.11.124:55979 (ESTABLISHED)
sshd    293033 xiao    4u  IPv4 3082136      0t0  TCP iZ7xvhevxjvf4dzop816ukZ:ssh->113.140.11.124:55979 (ESTABLISHED)

使用 ss

$ sudo ss -tulnp | grep ':22'
tcp   LISTEN 0      128                0.0.0.0:22         0.0.0.0:*    users:(("sshd",pid=963,fd=3))

$ sudo ss -nltp | grep ':22'
LISTEN 0      128          0.0.0.0:22         0.0.0.0:*    users:(("sshd",pid=963,fd=3))

使用 fuser

$ sudo fuser 22/tcp
22/tcp:                963 292636 292692 292957 293033