[SOLVED] Can someone please provide an alternative to the "lsof" command

Issue

I'm using if lsof -Pi :8080 -sTCP:LISTEN -t >/dev/null ; and it worked fine on RHEL6 (4.82). But on RHEL5 (4.78) I'm seeing an error:

lsof: unsupported TCP/TPI info selection: C lsof: unsupported TCP/TPI info selection: P lsof: unsupported TCP/TPI info selection: : lsof: unsupported TCP/TPI info selection: L lsof: unsupported TCP/TPI info selection: I lsof: unsupported TCP/TPI info selection: S lsof: unsupported TCP/TPI info selection: T lsof: unsupported TCP/TPI info selection: E lsof: unsupported TCP/TPI info selection: N lsof 4.78.

Can someone suggest an alternative to the above command?

I'm using this command to check the application status of servers with my assigned port numbers.

Solution

This gives you the PID and the port status.

netstat -pln | grep 9080

if you have multiple ports to check for, you could use this

for portnum in 9080 8080 8088 9082
do
     if [ $(netstat -pln 2>/dev/null | grep -c ${portnum}.*LISTEN) -eq 1 ]
     then
          echo "Port ${portnum} is up"
     else
          echo "Port ${portnum} is down"
     fi
done

you can ignore the "2>/dev/null" if you are running the command under root.

Answered By - SudoAgent