listening_ports.sh.sh

#!/bin/bash

if [[ ${USER} != "root" ]]; then
    echo
    echo
    echo "Only listing ports that user \"${USER}\" has access to, run as root if all ports are needed"
    echo
else
    echo
    echo
fi

OPENPORTS=$( netstat -an | grep "^tcp" | grep " LISTEN" | awk ' { print $4 } ' | awk -F":" ' { print $NF } ' | sort -n | uniq )

#OPENPORTS="22"

for PORT in ${OPENPORTS}; do
    LSOF=$(lsof -i :${PORT})
    if [[ "${LSOF}" != "" ]]; then
        echo "---------------------------------------------------"
        echo "LISTEN PORT: ${PORT}"
        LSOF_PIDS=$( echo "${LSOF}" | awk ' { print $2 } ' | grep -v "PID" | sort -n | uniq | tr "\n" " " )
        echo "${LSOF}" | awk ' { print "\t"$0 } '
        echo
        echo "Process information:" | awk ' { print "\t"$0 } '
        for LSOF_PID in ${LSOF_PIDS}; do
            ps -ef | awk -v LSOF_PID="${LSOF_PID}" ' $2==LSOF_PID ' | awk ' { print "\t"$0 } '
        done
        echo
    fi
done