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BASIC LINUX COMMANDS

Nmap Commands for Educational Use only. Nmap is a network scanning tool used by system administrators, IT professionals, and students for security auditing, troubleshooting, and learning. Common Scans nmap -sP → Ping Scan: Checks which devices are active on a network. nmap -sS → TCP SYN Scan: Helps discover open services. nmap -sU → UDP Scan: Finds active UDP services. nmap -sV → Version Detection: Identifies service versions for maintenance. nmap -O → OS Detection: Detects operating system type (for compatibility testing). nmap -A → Aggressive Scan: Runs multiple checks for detailed results. Timing & Input nmap -T4 → Timing Template: Controls scan speed. nmap -iL → Input from List: Reads targets from a file (useful for admins). nmap -sn → Host Discovery: Finds devices without scanning ports. Advanced TCP Techniques nmap -sX → XMAS Scan: Uses a special test packet to check responses. nmap -sF → FIN Scan: Uses a different method for host analysis. nmap -sT → TCP Connect Scan: Connects directly to services. nmap -sN → Null Scan: Uses empty packets to analyze responses. nmap -sA → ACK Scan: Helps detect firewall filtering. Scripting & Port Options nmap -sC → Default Script Scan: Runs safe built-in scripts. nmap --script