Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
grep "^[a-zA-Z]*:.*:A" foo | while read LINE do echo $LINE done
grep "^[a-zA-Z][0-9]:.*:A" foo | while read LINE do echo $LINE done
grep "^[a-zA-Z]*[0-9]:.*:A" foo | while read LINE do echo $LINE done
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