top
top is a command-line utility in Unix-like operating systems that provides a dynamic, real-time view of running processes and system resource usage, such as CPU and memory. It displays a continuously updated list of processes, sorted by various criteria like CPU consumption, and includes summary information about system performance. It is commonly used for system monitoring, troubleshooting performance issues, and identifying resource-intensive processes.
Developers should learn and use top for real-time system monitoring, especially when diagnosing performance bottlenecks, memory leaks, or high CPU usage in applications. It is essential in server administration, DevOps, and debugging scenarios where quick insights into process behavior are needed, such as identifying runaway processes or optimizing resource allocation in production environments.