free:tldr:e31da

The command "free -h" is used to display memory usage on a Linux system, but with human-readable format.

Here is the breakdown of the command:

• "free" is the basic command to display memory usage.
• "-h" is a flag that formats the output to be more readable by humans.

The output of the command provides information about the system's memory utilization in the following columns:

• "total": total physical memory installed in the system.
• "used": amount of memory currently being used.
• "free": amount of memory not being used.
• "shared": memory shared between different processes.
• "buff/cache": memory used for file buffers and disk cache.
• "available": memory that can be immediately reclaimed without causing any issues.

The memory values are displayed in sizes that are more legible to humans, using units like kilobytes (K), megabytes (M), and gigabytes (G). By using the "-h" flag, the values are automatically converted to the appropriate units.