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Hi.

Perhaps this link will help?

https://www.unix.com/unix-dummies-questions-answers/3197-making-sh-wait-user-input.html

I wrote a function to handle different cases of pause in shell scripts. You can simplify it for your needs.
pause() { # [1:timeout] [2:prompt]
local P T
[[ $1 =~ ^[0-9]+$ ]] && { T=$1; shift; }...

That was useful. I thought these bullets points in at FAQ were good:

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