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Usefull nmap command to know:

    Port scanning: nmap -sS <IP address> (TCP SYN scan) or nmap -sU <IP address> (UDP scan)
    OS and version detection: nmap -A <IP address>
    Service and version detection: nmap -sV <IP address>
    Script scanning: nmap --script <script name> <IP address>
    Fast scanning: nmap -F <IP address>
    Target specification: nmap -iL <input file> or nmap -iR <number of hosts>
    Output formatting: nmap -oN <output file> or nmap -oX <output file>
    Ping scanning: nmap -sn <IP address>
    Specifying a port range: nmap -p <port range> <IP address>
    Updating Nmap scripts: nmap --script-updatedb

Note: Nmap is a powerful and widely used tool for network discovery and security auditing.
The commands listed above are just examples of what you can do with Nmap, but it has many more capabilities. 
It's recommended to check the official documentation and tutorials to learn more about its features and usage.