Basic Memory check in a Unix host:
If the system is busy and if you want to watch how much memory is being used and free, you can run free command. However, this is something you might have already come across. But as I mentioned you can actually watch the trend of usage for every desired period of time. (lets say 10 seconds) This can be accomplished by adding the flag -s and then the number of seconds as per the need. To stop the execution, you can use Ctrl+C.
An example below,
Command used: free -ms 10
