Auto confirm when running bash scripts?

Question

I am working on a simple bash script that configures new servers how I want them. It's nothing special but it will hopefully save me quite a lot of time in the future.

How do I prevent prompts like this:

  You are about to add the following PPA to your system:
    Stable version of nginx.
    More info: https://launchpad.net/~nginx/+archive/stable
  Press [ENTER] to continue or ctrl-c to cancel adding it

When running commands like this from a script:

  sudo add-apt-repository ppa:nginx/stable 
  sudo apt-get update
  sudo apt-get -y install nginx

Is there an auto accept flag that I can set or something like that?

Answer 1

add-apt-repository has a -y flag you can use, which should do the trick.

Though I really want to suggest that you look at configuration management systems like puppet or chef to configure servers. They'll save you a lot of time!