How to implement default value in read in bash script?

Question

linux

I'm trying to implement a dialog in a bash script that will allow you to enter data. For example: port number. But I also want to implement the ability to continue without entering a value, so that the default value is substituted.

How do I do it

read -e -p "
Enter agent port. Default: 8080 " agent_p

Could you tell me how to implement such a dialogue?

Answer 1

def=8080
read -e -p "
Enter agent port. Default: $def " agent_p
 || agent_p=$def

Answer 2

https://habr.com/ru/company/ruvds/blog/328436/