What I need

I have an existing script that pulls port information for domains and stores it into a text file called portscan.txt. Example:

portscan.txt file:

somedomain.com:80

somedomain.com:443

I want to delete the information only if certain conditions are met. These conditions include:

• The file with the domains should have 2 or less lines


• The ports should only be 80 or 443 (i.e., I don't want to delete the file if 8080, 8443, or any other port exists in the file).

Note: So basically, the example file provided above should be deleted, but I do not want to delete the file if there are 2 lines, but the ports are 8080 or 8443 (or any other port for that matter)
Example like so:

somedomain.com:8443

somedomain.com:443

This should not be deleted.

What I tried

I attempted scripting this out and here's what I have:

#!/bin/bash



lines=$(cat portscan.txt | wc -l)

ports=$(cat portscan.txt | grep -Pv '(^|[^0-9])(80|443)($|[^0-9])')





if [[ $lines < 3 ]] && [[ $ports != 80 ]]; then

    if [[ $ports != 443 ]]; then

        echo "I need to delete this"

    fi

else

    echo "I will NOT delete this..."

fi

This is the second rendering of the script, I attempted nested if statements because I was unable to do a condition like this:

IF portscan.txt is less than two lines AND the ports are NOT 80 OR 443

I also attempted this in a much simpler manner like so:

#!/bin/bash



lines=$(cat portscan.txt | wc -l)

ports=$(cat portscan.txt | grep -Pv '(^|[^0-9])(80|443)($|[^0-9])')





if [[ $lines < 3 ]] && (( $ports != 80||443 )); then

    echo "I need to delete this"

else

    echo "I will NOT delete this..."

fi

I have tried the (( because I read that this is better to be used with arithmetic functions -- which is what I thought I needed, but I'm not as bash savvy with conditional arguments when it should be like: "This and that or that".

Hopefully this makes sense, any help would be greatly appreciated!