This will return no lines if the port is not available and return the port’s status line if available. If you wanted to check port 22 only, for example, you might run the command below: nmap | grep "22/tcp" Of course, you can always pipe the results of nmap into grep to search for specific results. Depending on what you’re looking for, these flags may help you find it. This will turn on more verbose logging levels, producing a more readable but longer standard output. To get more verbose results, add the -vv or -v3 tag. See the nmap man page for more scanning modes. For example, the -sP mode switch will scan for IP addresses but not ports, functioning something like arp below. The -sS flag and other scanning mode switches must be run with sudo. As such, the remote server likely won’t log the scan. This has the effect of forcing “half-open” scanning and sends a TCP SYN packet to check whether the port is open but does not respond with an ACK packet when receiving an affirmative response.
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