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How To Find Files by Content Under UNIX

I had written lots of code in C for my school work and saved it as source code under /home/user/c/*.c and *.h. How do I find files by content such as string or words (function name such as main() under UNIX shell prompt?
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Grep Words From a File

Q. How do I grep words from a text file under UNIX / Linux / BSD operating systems?
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