Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Using heredocs for script input

Since heredocs allow us to simply pass newline-delimited input to a command, we can use this to run an interactive script in a non-interactive manner! We have used this in practice, for instance, on database installer scripts that could only be run interactively. However, once you know the order of the questions and the input you want to supply, you can use the heredoc to supply this input to that interactive script.

Even better, we have already created a script that uses interactive input, /home/reader/scripts/chapter_11/while-interactive.sh, which we can use to show this functionality: 

reader@ubuntu:/tmp$ head /home/reader/scripts/chapter_11/while-interactive.sh#!/bin/bash##################################### ...