Just looking at these numbers, we see that this system has roughly 2 GB of RAM and that nearly 95% of it is used. The -m option displays the information in terms of megabytes rather than kilobytes (the default). The second, labeled Mem: displays information on how physical memory is being used. The first line of the free command's output contains the column headings.
Swap is some portion of space on your hard drive that is used as if it is an extension of your physical memory. Physical memory is the random access storage provided by the RAM modules plugged into your motherboard. The free command will tell you about used and unused memory and about swap space. The first that probably comes to mind is free. Let's look at some basic commands that report on memory usage.
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