Which file exposes CPU information in Linux?

• A. /proc/meminfo
• B. /proc/uptime
• C. /proc/loadavg
• D. /proc/cpuinfo

Answer: (D)

Linux exposes per-processor details via the /proc/cpuinfo file in the virtual /proc filesystem. This file contains a block of information for each logical CPU, including fields like processor (the CPU number), vendor_id, model name, cpuMHz, cache size, and various feature flags. On systems with multiple cores or hyper-threading, you’ll see multiple blocks—one for each CPU—so you can determine how many logical processors you have and details about each. The other files mentioned provide different data: /proc/meminfo is about memory usage, /proc/uptime shows how long the system has been up and idle time, and /proc/loadavg shows system load averages. So /proc/cpuinfo is the file that exposes CPU information. You can view it with cat /proc/cpuinfo or use a more user-friendly tool like lscpu to summarize the same data.