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'expect' is definitely for edge-case automation, but in the few cases where it is useful, it is extremely useful. Despite the fact that it's quite 'old fashioned', it is a dependency of DejaGnu which, itself, is a dependency of the test cases for a huge number of GNU projects. This leads me to believe that it'll still be around for a very long time and will continue to work the same as it does now.

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I used it as recently as a couple years ago to make short work of some build + deployment stuff on some slightly unusual platform. Might've been Garmin wearables? Something like that.

When you need "expect", it's wonderful.

Sure, but is it worth learning TCL for a few edge-cases? I like python, so I used "pexpect" in the past. I am sure other languages have such libraries too.

And if you are going for solid production, you probably want to re-implement "expect" anyway -- so all input is whitelisted and unexpected messages are flagged. You probably don't what to break your expensive 1990's industrial device because you were driving it with expect script, and it cheerfully ignored "WARNING RESERVE BATTERY DEAD, REPLACE BEFORE POWER OFF" messages.

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