Procfs
Procfs (short for Process File System) is a virtual filesystem in Unix-like operating systems that provides a file-based interface to kernel data structures, primarily about processes and system information. It is typically mounted at /proc and allows users and programs to access real-time system and process details (like memory usage, CPU statistics, and open files) as readable files and directories. This enables system monitoring, debugging, and process management without requiring direct kernel calls.
Developers should learn Procfs when working on system-level programming, performance monitoring, or debugging in Linux/Unix environments, as it provides a standardized way to inspect running processes and system state. It is essential for tasks like writing system administration tools, analyzing resource usage in applications, or troubleshooting performance issues, as it offers low-level insights that are not easily accessible through other APIs.