"The nmap command (short for network mapper) is a network exploration/security auditing tool that can rapidly scan networks to help you find out what hosts are available. With nmap, you can discover open ports and services, and even find out what operating systems are on your network. I've used nmap to find out what machines are on a network and what ports/services are open. If I find a port that shouldn't be open, I can close it to avoid security issues."
"The thing is, nmap can do a lot. In fact, if you were to read the manual page (man nmap), you'd likely come away confused and intimidated. That's unfortunate, because nmap can come in very handy. To avoid the confusion and intimidation, I'll demonstrate some of the more useful things you can do with nmap. Without further ado, open your terminal app and get ready to scan."
Nmap performs network exploration and security auditing by scanning hosts to identify available machines, open ports, running services, and probable operating systems. Nmap installs easily on common Linux distributions using apt, dnf, or pacman package managers. Nmap supports OS discovery with aggressive scanning (-A) to reveal Service Info and CPE data identifying Linux kernels or other OS signatures. Nmap can locate unexpected open ports and services so administrators can close them to reduce attack surface. The tool includes many commands and options, and practical examples simplify common tasks for faster, effective network security auditing.
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