How to skip "please [Enter] to continue" during automating apt-get install?

Question

I have a script to install trough a automated process.

Here is an example:

  sudo apt-get update
    clear

    sudo apt-get install -y nginx
    clear

It works good, but not when I need to add a PPA.

Here I have this following message:

please [Enter] to continue or ...

At this point I need to press the enter to continue the process.

How can I skip this question and make it "Enter" by default?

This is an example that ask me to press [Enter]:

sudo add-apt-repository ppa:webupd8team/sublime-text-3
sudo apt-get update
sudo apt-get install -y sublime-text-installer
clear

sudo add-apt-repository ppa:webupd8team/java  
sudo apt-get update
sudo apt install -y oracle-java8-installer
clear

Answer 1

you can use -y option like $ sudo add-apt-repository -y [repo].

before start asking questions, see the man pages for softwares.

Update:

You can use man add-apt-repository for getting more information.