TestOut Linux Pro Practice Test 2025 – Complete Exam Prep Guide

The command that provides the total physical memory in the system is indeed the one that reads from the `/proc/meminfo` file. This file contains detailed information about the system's memory usage, including total physical memory, free memory, and various memory statistics.

When using the command `cat /proc/meminfo`, you will see a list of memory-related metrics, with the line starting with "MemTotal" indicating the total amount of physical RAM installed in the system. This makes it a reliable source for obtaining current memory statistics directly from the system's kernel.

The other options don't lead to the same result. For instance, `/proc/memoryinfo` and `/proc/memory` do not exist in a standard Linux file system, rendering those commands invalid. As for the option simply named "memoryinfo," it is not a recognized command in Linux systems, and without a preceding `cat` or another utility, it would not provide any useful output. Thus, the correct and effective command is clearly `cat /proc/meminfo`.