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Expect is a programming language for automating interactive applications. Typically used in combination with the Tcl (Tool Command Language) scripting language, Expect enables commands to be scripted and sent as if entered manually, allowing for automated control of interactive command-line programs. It uses scripts that can interact with an application by responding to expected prompts and outputs, simulating user actions while providing facilities for controlling the flow of interactions based on results received from the program being controlled. This tool has broad utility in system administration tasks, such as network configuration and software installation processes where it allows more complex sequences of operations to be automated without requiring extensive modification to existing applications or their interfaces.