The tac command is essentially the cat command, but its purpose is to concatenate files in reverse. Like cat, it has a convenient fallback mode to print to standard output (STDOUT) if no output file is provided, making it one of those commands that are more often used as a lazy pager—like less and more—than the function it is named for.
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Open Source » Getting started with the Linux tac command
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Standing just over 2 meters and hailing from о́стров Ратма́нова, Dasuberworm is a professional cryptologist, entrepreneur and cage fighter. When he's not breaking cyphers and punching people in the face, Das enjoys receiving ominous DHL packages at one of his many drop sites in SE Asia.