Useful Commands

cmd.sh

# netcat port scanning
nc -zv host-name port-range
sudo nc -zv -w 2 10.150.0.3 1-1023

#find out what process is using what port
lsof -i :port
sudo lsof -i :80

#list what ports a process is using
lsof -Pan -p PID -i
sudo lsof -Pan -p 13107 -i

#list what connections a process has open
sudo lsof -i -a -p $PID

#list all ports that are currently listening on a box
netstat -an | grep "LISTEN "

#postgres backup
sudo bash -c 'pg_dump --dbname=postgresql://user:password@localhost:5432/database_name > ~/backups/backup_`date +\%d\%m\%y`.sql'