top
top is a command-line utility in Linux and Unix-like operating systems that provides a dynamic, real-time view of running system processes, including CPU and memory usage. It displays a continuously updated list of processes sorted by resource consumption, allowing users to monitor system performance and identify resource-intensive tasks. The tool is included by default in most Linux distributions and is essential for system administration and troubleshooting.
Developers should learn top for real-time system monitoring, especially when debugging performance issues, identifying memory leaks, or managing server resources in production environments. It is particularly useful for DevOps engineers, system administrators, and backend developers working on Linux servers to quickly assess system health and kill misbehaving processes without needing a graphical interface.