About reinstalling OS X Mavericks?

I recently deleted a crucial system file for console.
I am now looking to reinstall OS X Mavericks.
I have a question about this first before I do it though if I reinstall the OS on the same hard drive that the MacBookPro boots from will I lose any files at all?
I have heard from a lot of different sites that I won't but I want to be 100% sure since I can't afford to lose any files since I use the computer for college?

If everything during the upgrade works correctly, your data should be safe.
Having said that do I trust my data to everything working correctly, never.
In fact I backup everything at least twice.
My thinking is that it is always better to have a backup and not needed it then to need a backup and not have it.
Allan

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