#This will report the percentage of memory in use
% free | grep Mem | awk '{print $3/$2 * 100.0}'
#Ex:23.8171
#This will report the percentage of memory that's free
% free | grep Mem | awk '{print $4/$2 * 100.0}'
#Ex:76.5013
#You could create an alias for this command or put this into a tiny shell script. The specific output could be tailored to your needs using formatting commands for the print statement along these lines:
free | grep Mem | awk '{ printf("free: %.4f %\n", $4/$2 * 100.0) }'
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