referencing https://twitter.com/netsecfocus/status/1099049852112117760 ;
No nmap? No problem! Grab banners from local IPv4 listening ports. Look at me ma! I done a regex.
netstat -nlt | grep 'tcp ' | grep -Eo "[1-9][0-9]*" | xargs -I {} sh -c "echo "" | nc -v -n -w1 127.0.0.1 {}"