bash: exit tool if nothing happens

Question

The following script doesn't exit on terminal until I hit enter.

Need a script to exit automatically if nothing happens for some seconds. Or when all lines from the file is read.

#!/usr/bin/bash
    
# Usage: ./tool.sh domains.txt

for addr in $(cat $1);do
        host $addr | grep "has address" | cut -d" " -f1,4 &
done

You can make a list of the following addresses to test the script:

google.com
yahoo.com
amazon.com
twitter.com

Notice: I don't want to remove the ampersand "&" from the script.

Thx.

Answer 1

I added exit_code=$! and wait $exit_code to my script to solve the problem.