How does read builtin survive the pipe stdin redirection?

[Babagilo]

Hi, guys,

I tried to add some interactivity to allow user to abort or continue an operation by using the read command which is similar to below existing statement:

read -p "Do you want to prune (permanently delete) all the orphaned node instances? (N/y): " -n 1 -r

But the problem is that if the treetool is running alone, the read builtin will prompt the user as expected, but when it is piped with another treetool command, then the prompt is not happening.

I guess it's because read by default only prompts to stdin, but when the redirection pipe happens, something happened and such user interface is suppressed. But I don't know how to fix it.

Please advise.

Regards,
Babagilo