What is the purpose of the /proc filesystem in Linux?

What is the purpose of the /proc filesystem in Linux?

• A. It stores user documents.
• B. It contains executable binaries for user applications.
• C. It logs kernel messages to a separate log.
• D. It exposes kernel and process information in real time.

Answer: (D)

The /proc filesystem is a virtual filesystem that presents kernel and process information in real time. It doesn’t store files on disk; instead, reading files under /proc asks the kernel to generate current data about the system. You can see details like CPU information, memory usage, and system version in files such as /proc/cpuinfo, /proc/meminfo, and /proc/version. It also exposes per-process information through directories like /proc/[pid]/, which reflect the state of each running process (command line, status, open file descriptors, etc.). Some files under /proc/sys allow you to tune kernel parameters, but writing to them affects the live system. Because the data is produced on demand by the kernel, reading /proc gives a real-time view of kernel and process activity.

The /proc filesystem is a virtual filesystem that presents kernel and process information in real time. It doesn’t store files on disk; instead, reading files under /proc asks the kernel to generate current data about the system. You can see details like CPU information, memory usage, and system version in files such as /proc/cpuinfo, /proc/meminfo, and /proc/version. It also exposes per-process information through directories like /proc/[pid]/, which reflect the state of each running process (command line, status, open file descriptors, etc.). Some files under /proc/sys allow you to tune kernel parameters, but writing to them affects the live system. Because the data is produced on demand by the kernel, reading /proc gives a real-time view of kernel and process activity.