linux: which process is listening on port X?

Discovered a new tool, ss, to view "socket statistics. From the man page:

Name
ss - another utility to investigate sockets

Synopsis
ss [options] [ FILTER ]

Description
ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP information than state than other tools.

[root@g2aqa3br1.qai ~]# ss -t
State      Recv-Q Send-Q      Local Address:Port          Peer Address:Port
ESTAB      0      0               127.0.0.1:56227            127.0.0.1:6802
ESTAB      0      0               127.0.0.1:56228            127.0.0.1:6802
ESTAB      0      0            172.29.8.131:38140          10.230.6.27:ldaps
ESTAB      0      0            172.29.8.131:38142          10.230.6.27:ldaps

reference: http://linux.die.net/man/8/ss

 

[root@g2aqa3br1.qai ~]# netstat -plunt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 ::ffff:172.29.8.131:1098    :::*                        LISTEN      18572/java
tcp        0      0 :::1099                     :::*                        LISTEN      18572/java
tcp        0      0 :::80                       :::*                        LISTEN      26695/httpd
tcp        0      0 :::22                       :::*                        LISTEN      7327/sshd
tcp        0      0 :::443                      :::*                        LISTEN      26695/httpd
udp     2616      0 0.0.0.0:514                 0.0.0.0:*                               6898/syslogd
[root@g2aqa3br1.qai ~]# ps 26695
PID TTY      STAT   TIME COMMAND
26695 ?        SNs    0:00 /opt/ec/apache2/bin/httpd -d /opt/ec/apache2 
-f /opt/ec/broker/conf/httpd.conf -k start -DSSL

reference:
http://www.cyberciti.biz/faq/find-out-which-service-listening-specific-port