For those seeing "Expect" and not knowing what's going on: https://en.wikipedia.org/wiki/Expect

One of Tcl's first "killer apps". Don Libes' (creator of Expect) book "Exploring Expect" is also one of those technical masterpieces that are very enjoyable, entertaining technical reads. Recommended if only for the discussions of terminals and interactive i/o.

[edit: typo/punctuation]