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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Regular-Use Android Apps

Fancy Widget

OK, so this is a widget and not a standard app, per se. However, it is useful, especially when one doesn’t have an HTC phone with the already-present clock widget.
Pros: It is fully customizable. The widget shows an analog clock, the date, the battery level, and the weather.  You can choose to show whatever you want out of those options though. You can even customize the options when you tap on part of the display. For example, I have mine setup to go to the clock settings when I tap on the clock part of the widget. When I tap on the weather, a five-day forecast pops up and I customized it to go to The Weather Channel app on my phone when I tap on that forecast.
Cons: Sometimes the GPS is a bit off and you may have to refresh the weather forecast screen.
http://www.appbrain.com/app/fancy-widget/com.anddoes.fancywidget
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