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    Apparently, some posts say that in Redhat Linux you can do someting like top -M to display the usage in MB. If you only want to monitor the memory usage, you can use rather use htop. Not sure of any other option. Commented Dec 19, 2013 at 15:54
  • Right you are, but there is nothing about that in build-in help. I've just occasionally was able to find that in man page Commented Dec 19, 2013 at 15:56
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    The man page is the builtin help. Commented Dec 19, 2013 at 15:59
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    You could always use free -m, or better free -h instead. Commented Dec 19, 2013 at 16:48
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    Once you jump into top hit E until it shows the memory cumulative you're looking for, then hit W to write that configuration to disk. Commented Apr 13, 2015 at 2:07