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Learn to find used and free RAM memory at the Linux command line.
Videos can also be accessed from the Linux Essentials Playlist on YouTube.
Linux free Command Summary with Examples (3:12)
Our fifty-third word, or command to memorize is
free from our category
free allows you to display memory in
||Print help screen|
||Report memory in megabytes|
||Print memory with labels|
Recall from the last three videos we've been reviewing memory usage on disks, now we'll shift the focus to memory in RAM.
Before we start, it helps to think of commands as mini programs and
most follow this structure:
command -option(s) argument(s).
free command has
14 options and here there are no arguments, because
you're just focused on one thing, RAM.
Like most commands, help is available with double-dash
-m option is used for megabytes, and
-h reports human-readable output
with M for megabytes, G for
gigabytes, and so on.
So why is
free an important command?
Well, if your system is sluggish,
will help you identify if a process is, in fact, eating up system
And now you know how to do that.
Okay, the best way to embed this in your memory is by typing in your own terminal window.
Find this on your Mac using a program called Terminal. On Linux use Terminal or Konsole, and currently Microsoft is adding this functionality to Windows.
Here we go. Let's go optionless.
And see the output, it's pretty easy. This is fine, but a little tough to decipher, right?
-m option will show the
same information in megabytes, which is easier to review quickly.
Seventeen hundred megabytes in RAM total, thirteen-hundred free. And here we'll just focus on these two figures for now.
And last, let's run
free again using
the human-readable option
Notice how this is the easiest form to grasp. 1.7 Gigs total, 1.2 Gigs free, some megabyte measures here. Not bad, huh?
Okay now you know how to use
And you know the syntax for commands, options and arguments.
One last tip about the
So another option to keep in mind, is the
-g option which presents everything
in gigabytes, if you are in a high memory environment.
Okay, thanks for visiting today. I hope this was a helpful
introduction to the
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ducommand, hit Back.
pg, click Next.
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