Which command displays the amount of free and used memory in Linux?

The command that displays the amount of free and used memory in Linux is the one that provides a concise summary of the system's memory usage. This command presents information about total memory, used memory, free memory, and memory used by buffers and caches, typically categorized in a straightforward table format. It can also optionally show memory usage in megabytes or gigabytes, depending on the options used.

For instance, when executing the command in a terminal, users can instantly see how much memory is available for processes, how much is being consumed, and additional insights into different types of memory allocation. This is essential for monitoring system performance and diagnosing potential memory-related issues.

Other commands mentioned, while useful for various tasks, do not specifically focus on displaying memory usage in the same detailed way. Some commands might show disk usage or system processes, but they do not provide a direct overview of memory allocation.