netstat
netstat (network statistics) is a command-line network utility that displays network connections, routing tables, interface statistics, masquerade connections, and multicast memberships. It is available on most operating systems, including Windows, Linux, and macOS, and is used for monitoring and troubleshooting network-related issues by providing detailed information about active network connections and listening ports.
Developers should learn netstat for diagnosing network problems, such as identifying which ports are open or in use, checking for unauthorized connections, and monitoring network traffic in real-time. It is particularly useful in server administration, security auditing, and debugging network applications to ensure proper communication and detect potential vulnerabilities or performance bottlenecks.