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In the landscape of Linux system administration, monitoring system resources is crucial for maintaining performance and stability. One of the fundamental metrics to keep an eye on is memory usage. The free command is a built-in utility in most Linux distributions that provides a quick and clear snapshot of the system's memory usage including total, used, free, shared, buffers, and cache memory. Here’s a comprehensive guide on how to utilize the free command effectively along with installation instructions for different package managers where necessary. The free command displays the amount of free and used memory in the system. This includes physical memory and swap space, as well as the buffers and caches used by the kernel.