Work great and have made some improvements

I tested this plug-in and liked it a lot. There are others but this one doesn’t have any dependencies other than ‘bash’ and ‘free’, and makes a nice chart.

I felt it was a little inefficient so I made some tweaks to reduce the number of forks required. I also tweaked the chart. My changes are on Github.

https://github.com/whereisaaron/linux-check-mem-nagios-plugin