# Introduction This challenge will test your knowledge of the `sed` command, a powerful text manipulation tool available in Linux. The challenge will be divided into several steps, each one building on the previous step. `sed` stands for Stream Editor and is a powerful command-line tool that can perform a wide range of text manipulation functions, including search and replace, deleting lines, inserting and appending text, and more. `sed` works by reading text from standard input (stdin) or a file, performing a specified operation on the text, and then outputting the result to standard output (stdout) or a file.
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