RHEL Linux Red Hat System Administration 2025 – 400 Free Practice Questions to Pass the Exam

To check the available memory in RHEL, the command `free -h` is utilized because it provides a clear and concise overview of the system's memory usage. The `free` command reports the total amount of free and used physical and swap memory in the system, along with buffers used by the kernel. Using the `-h` option presents this information in a human-readable format, displaying values in bytes, kilobytes, megabytes, or gigabytes, which makes it easier for users to quickly interpret the memory status.

This command is part of the essential toolkit for system administrators when monitoring system performance, and it effectively summarizes critical memory statistics with a single command. The `free` command's capability to show not only total memory but also how much is used versus what remains free is vital for assessing system resource allocation and troubleshooting potential performance issues.

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