Which command allows you to check the available memory in Linux?

The command that allows you to check the available memory in Linux is free. When you execute this command, it provides a summary of the system's memory usage, including total available memory, used memory, free memory, shared memory, and buffers/cache memory. It presents the information in a clear format, making it easy for users to assess how the system’s memory resources are allocated and utilized.

Using free is particularly valuable for system administrators or users who need to monitor memory consumption, ensuring that they can maintain system performance and troubleshoot any potential memory-related issues.

In contrast, the other commands serve different purposes. memstat is not a standard command in Linux for checking memory, and it may not be available on all systems. The df command is used to report filesystem disk space usage, not memory. Similarly, while top does show system resource usage, including memory, it provides a dynamically updating overview of system processes and resource usage rather than a simple summary, which might not be as straightforward for specific memory inquiries.