What Process Is Using What Port

Sometimes a port becomes blocked or you are getting hammered by something on the net, its useful to know what port is being used by what process

#!/bin/bash
port=$1
procinfo=$(netstat --numeric-ports -nlp 2> /dev/null | grep tcp | grep -w ${port} | tail -n 1 | awk '{print $7}')

case "${procinfo}" in
"")
echo "No process listening on port ${port}"
;;
"-")
echo "Process is running on ${port}, but current user does not have rights to see process information."
;;
*)
echo "${procinfo} is running on port ${port}"
ps -uwep ${procinfo%/*}
;;
esac

Once you have the file saved, make it executable either using graphical tools or from a console
chmod +x filename.sh the .sh extension tells the graphical enviroment that its a shell script

Copy this file into any directory with any files in it. Double click the script file and select from the options that come up run in terminal. The script should then convert all files in the directory the file is in to lower case. Or you can just run the script from a terminal by typing

./filename.sh

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What Process Is Using What Port