Finds pids that are listening to ports (atm tcp6 on all interfaces only). Ideas for extension include: udp/tcp/udp6, support different interfaces, generate improved output (nice grep-able overview), ...

getlisteningpids.sh

#Finds pids that are listening to ports (atm tcp6 on all interfaces only)
netstat | grep LISTEN | grep tcp6 | awk '{print $4 }' | awk -F':' '{print $4}' > /tmp/ports.txt
#convert ports to hex
cat /tmp/ports.txt | while read myline; do printf '%x\\n' $myline ; done > /tmp/hexports.txt
#get inodes from hex ports
grep -i -f /tmp/hexports.txt /proc/net/tcp6 | awk '{print $10}' > /tmp/inodes.txt
#get pids tied to inodes
lsof | grep -f /tmp/inodes.txt | awk '{print $2}' > /tmp/pids.txt