The `sed` command, short for 'stream editor', is a powerful Unix utility used for parsing and transforming text in a data stream or a file. It allows users to perform basic text transformations on an input stream, such as substitution, deletion, and insertion, making it an essential tool for text processing in command-line environments. This utility works by applying various scripts or commands to each line of input, making it possible to automate repetitive text editing tasks efficiently.
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