You can use the following command to see the percentage of memory used on a Linux system. Keep in mind that all it's actually doing is adding together the memory percentage used lines for each process listed. Depending on your input method, the results could vary a little, but should generally be in the same ballpark.
The first example below adds together everything in the 4th column of "ps" output.
The second example takes input from top, by running just one time in batch mode. Then it adds together the values in the 10th column.
ps aux | awk '{sum +=$4}; END {print sum}'
top -b -n 1 | awk '{sum +=$10}; END {print sum}'
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