Question

So, I’m using netstat -lt to get open ports. However, I’m not interested in certain values (like SSH or 22), so I want to be able to exclude them. I also want to get them as an array in bash. So far I have netstat -lt | sed -r 's/tcp[^:]+://g' | cut -d' ' -f1 but they’re not an array, nor am I excluding anything.

Answer 1

Add ($()) around your statement:

port=($(netstat -ltn | sed -rne '/^tcp/{/:(22|25)\>/d;s/.*:([0-9]+)\>.*/\1/p}'))

Filtering ports 22 and 25.