UNIX for Advanced & Expert Users

Hi all,

I work in three platforms SOLARIS,HPUX,AIX.

My requirement is to find the user id which is using a particular port.
So I tried searching commands which will help me to know which port is used by which process.
According to the posts over here lsof makes life easy in this case. But I dont have lsof installed on my unix box neither I am allowed to install.
I also tried various combinations of netstat command, but none worked.

Please do help me.

Thanks,
Vikas

In theory...

If you know the port number, you can see what process uses that port by grepping in /etc/services. Then, once you have that process name, you can

Code:

 
ps -ef | <process name>

and find the terminal. Then run

Code:

who -a | grep <terminal>

And you'll find the IP address and potentially the username. That'll get you close.

In theory...

I checked the services file available in /etc.
But that showed me the system ports that are enabled.

Hence one will not be able to decipher which port is being used by which process.

Thanks,
Vikas

Is there no way out other than lsof...???

On Solaris you can use the pfiles utility.

Code:

PORT=    #set it to the port number whose assocated process you want to find.
PIDS=`ps -ef | sed 1d | awk '{print $2}'`
for pid in $PIDS
do
        /usr/proc/bin/pfiles $pid 2>/dev/null | grep -q "port: $PORT"
        if [[ $? -eq 0 ]] ; then
               echo "Port: $PORT is being used by PID: \c" 
                           ps -o pid -o args -p $PID | sed 1d
        fi
done

Other OSes have similar functionality. You just need to search for it.