Clearing Ubuntu Cache Memory

Did a search for help on clearing up Ubuntu’s Cache System as my system keeps using up my memory for cache system. Though using up my memory for cache doesn’t actually hinder my system’s operation, I find it quite irritating to see it being used up even though I have 8GB of RAM. This command should work for most Debian based Linux Operating System, but I haven’t try them as I don’t own any now. Here is the link to the document.
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Introduction to Linux

What is Linux

Linux is an operating system.
Created in October,1991 in university of Helsinki by Linus Torvalds.
It is superset of kernel and application tools.

How to get it

It is available in forms of various distros or distribution.
Distros include kernel and application tools.
Examples are Ubuntu, Red Hat, Debian etc.
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