The Linux expect command takes script writing to an entirely new level. Instead of automating processes, it automates running and responding to other scripts. In other words, you can write a script that asks how you are and then create an expect script that both runs it and tells it that you’re ok.

Here’s the bash script:

#!/bin/bash

echo “How are you doing?”
read ans

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Here’s the expect script that provides the response to the query:

#!/usr/bin/expect

set timeout -1
spawn ./ask # ask is name of script to be run
expect “How are you doing?r”
send — “okr”
expect eof

When you run the script, you should see this:

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Source:: Network World – Linux