expect

Expect is a tool for automating interactive applications according to a script. Following the script, Expect knows what can be expected from a program and what the correct response should be. Expect is also useful for testing these same applications. An interpreted language provides branching and high-level control structures to direct the dialogue. The user can take control and interact directly when desired, afterward returning control to the script.

This package contains the expect binary and several Expect-based scripts including autoexpect, autopasswd, cryptdir, decryptdir, dislocate, kibitz, lpunlock, mkpasswd, and multixterm. These scripts provide specialized automation for tasks like generating Expect scripts from sessions, password management, directory encryption, process disconnection, multi-user shell sharing, and managing multiple xterms.

Expect is particularly valuable in cybersecurity for automating repetitive interactive tasks such as login sequences, protocol interactions, and testing application behaviors in controlled scripted environments.

Expect operates as an extension to Tcl, spawning interactive programs and monitoring their output for expected patterns. When a match occurs, it sends predefined responses via the 'send' command. Control structures like expect, timeout, and interact allow branching based on output, timeouts, or user intervention. Timing issues are handled with sleeps or conservative mode pauses. Scripts can be generated automatically using autoexpect, which records user interactions and converts them into Expect syntax, accounting for echoing and prompts.