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When working with text files in Linux, you might sometimes need to reverse the order of the lines. The typical tool for this task is tac, which is essentially cat in reverse. But what if tac is not available on your system, or you're looking for ways to accomplish this task purely with other Unix utilities? Let's explore how this can be done. Q: Why might someone need to reverse the lines in a file? A: Reversing lines can be useful in a variety of situations, such as processing logs (where the latest entries are at the bottom), data manipulation, or simply for problem-solving tasks in programming contests.