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With a Linux command, how can I find out what % of memory is free? [closed]


Using a Linux command line, I’d want to obtain the available memory given as a percentage.

I tried the free command, but it only returns numbers with no choice for percentages.

Asked by Timothy Clemans

Solution #1

Using the command free:

% free
             total       used       free     shared    buffers     cached
Mem:       2061712     490924    1570788          0      60984     220236
-/+ buffers/cache:     209704    1852008
Swap:       587768          0     587768

We use Mem to grab the line and awk to choose specific fields for our computations based on this output.

This will report the percentage of memory in use

% free | grep Mem | awk '{print $3/$2 * 100.0}'

This will show you how much RAM is available.

% free | grep Mem | awk '{print $4/$2 * 100.0}'

Create an alias for this command or include it in a small shell script. Formatting directives for the print statement along these lines could be used to adapt the specific output to your needs:

free | grep Mem | awk '{ printf("free: %.4f %\n", $4/$2 * 100.0) }'

Answered by Levon

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