查看那个进程占用了端口号（LINUX与AIX）

[root@limt ~]# netstat -tulp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 *:sunrpc                    *:*                         LISTEN      2151/rpcbind
tcp        0      0 *:50000                     *:*                         LISTEN      3542/db2sysc 0
tcp        0      0 192.168.122.1:domain        *:*                         LISTEN      2881/dnsmasq
tcp        0      0 *:ftp                       *:*                         LISTEN      2640/vsftpd
tcp        0      0 *:ssh                       *:*                         LISTEN      2611/sshd
tcp        0      0 localhost:ipp               *:*                         LISTEN      2343/cupsd
tcp        0      0 localhost:smtp              *:*                         LISTEN      2660/sendmail
tcp        0      0 *:38666                     *:*                         LISTEN      2281/rpc.statd
tcp        0      0 *:35339                     *:*                         LISTEN      2281/rpc.statd
tcp        0      0 *:sunrpc                    *:*                         LISTEN      2151/rpcbind
tcp        0      0 *:ssh                       *:*                         LISTEN      2611/sshd
tcp        0      0 localhost:ipp               *:*                         LISTEN      2343/cupsd
tcp        0      0 *:wbem-https                *:*                         LISTEN      2905/cimservermain
udp        0      0 *:kerberos-iv               *:*                                     2087/portreserve
udp        0      0 *:sunrpc                    *:*                                     2151/rpcbind
udp        0      0 *:rda                       *:*                                     2151/rpcbind
udp        0      0 *:ipp                       *:*                                     2343/cupsd
udp        0      0 *:rxe                       *:*                                     2281/rpc.statd
udp        0      0 *:ldaps                     *:*                                     2087/portreserve
udp        0      0 *:dhcp-failover             *:*                                     2087/portreserve
udp        0      0 *:783                       *:*                                     2087/portreserve
udp        0      0 192.168.122.1:domain        *:*                                     2881/dnsmasq
udp        0      0 *:bootps                    *:*                                     2881/dnsmasq
udp        0      0 *:bootpc                    *:*                                     2312/dhclient
udp        0      0 *:dhcp-failover2            *:*                                     2087/portreserve
udp        0      0 *:33375                     *:*                                     2281/rpc.statd
udp        0      0 *:sunrpc                    *:*                                     2151/rpcbind
udp        0      0 *:rda                       *:*                                     2151/rpcbind
udp        0      0 *:34398                     *:*                                     2281/rpc.statd

[root@limt ~]# fuser  -v 22/tcp
用户     进程号 权限   命令
22/tcp:              root       2611 F.... sshd
root       7441 F.... sshd

[root@limt ~]# lsof -i:22
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sshd    2611 root    3u  IPv4  16168      0t0  TCP *:ssh (LISTEN)
sshd    2611 root    4u  IPv6  16172      0t0  TCP *:ssh (LISTEN)
sshd    7441 root    3u  IPv4  48583      0t0  TCP 192.168.1.105:ssh->192.168.1.100:61791 (ESTABLISHED)

（1）先使用netstat命令查看端口系统内核地址（16进制），如查看ssh 22端口的进程。
# netstat –Aan |grep 22
f1000600044c7398 tcp4       0     52  134.96.194.9.22  134.96.90.123.1797 ESTABLISHED
f1000600044e4b98 tcp4       0      0  *.22            *.*                LISTEN
其中：f1000600044e4b98 tcp4       0      0  *.22            *.*                LISTEN
行为侦听端口22端口相关信息， f1000600044e4b98为系统内核地址。
（2）调用rmsock命令查看该端口对应的进程号：
# rmsock  f1000600044e4b98 tcpcb  ( socket、tcpcb、inpcb、ripcb 或 rawcb)
The socket 0x44e4808 is being held by proccess 447250 (sshd). ---显示端口22的进程号为447250。

# lsof -i:22
COMMAND    PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
sshd    107084 root    3u IPv4 0xf100070000a3a3b0      0t0 TCP *:ssh (LISTEN)