How to know PID responsible for network connection/listen?

[Tino Engel]

Matthias Apitz schrieb:
> El día Thursday, November 15, 2007 a las 11:20:30AM -0800, Yuri escribió:
>
>   
>> 'netstat -a' gives me the listing of network connection/listening records.
>> But there's no link to the process id that opened it.
>> With lots of processes this can be a significant problem to figure out who
>> opened which connection.
>>     
>
> For example, for the port 25 you see it with:
>
> # lsof -P | fgrep :25
> sendmail  6462  root    3u    IPv4 0xc5c3ecb0        0t0     TCP localhost:25 (LISTEN)
>
> i.e. the PID is 6462
>
> HIH
>
> 	matthias
>   
ps -Al show the parent PID of each process.