When and when not to use expect to automate interaction.
https://www.ibm.com/developerworks/community/blogs/brian/entry/when_to_use_expect_scripting_and_when_to_avoid_it10?lang=en
https://www.ibm.com/developerworks/community/blogs/brian/entry/when_to_use_expect_scripting_and_when_to_avoid_it10?lang=en