awk, named for its authors Aho, Weinberger, and Kernighan, is a very cool little tool that you know exists and is installed on your system, but you have never bothered to learn how to use. I’m here to tell you that you really ought to!
If I stop for a moment to ponder the question, “what is the coolest tool in Unix?”, the immediate answer is awk. If I insist on pondering it for longer, giving each tool a moment for fair evaluation, the answer is still awk. There are few tools as perfectly suited to their problem as awk is.
Source: awk is the coolest tool you don't know, an article by Drew DeVault.