Expect
Expect is a Unix automation and testing tool that allows developers to script interactions with command-line programs that require user input. It uses the Tcl scripting language to automate tasks such as logging into remote systems, running interactive applications, and performing automated testing by simulating keystrokes and responses. It is particularly useful for automating repetitive command-line tasks that involve prompts or dialogues.
Developers should learn Expect when they need to automate interactive command-line processes, such as SSH logins, FTP sessions, or software installations that require user input. It is valuable in DevOps for scripting deployment workflows, in testing for automating CLI-based test suites, and in system administration for batch processing tasks across multiple servers. Use cases include automating server provisioning, regression testing of command-line tools, and managing network devices.