Is there a way to force "Yes" to any prompts when installing from apt-get (from a bash script)? [duplicate]

I am trying to make a bash script that automates the installation of several packages that I use on any ubuntu machine. I frequently create virtual machines either through Amazon AWS or Digital Ocean and would like to just run one script to install all the packages I use.

Some of the packages I would like to install are Emacs and Node.js

The normal way I install these would be to run apt-get install Emacs, and while doing this I am always prompted with a warning about how much space this app will take up and if I am sure I want to continue.

Is there a way to automate this process, from a script, and always say "yes" to these prompts?

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3 Answers

From the OPTIONS section of man apt-get

-y, --yes, --assume-yes Automatic yes to prompts; assume "yes" as answer to all prompts and run non-interactively. If an undesirable situation, such as changing a held package, trying to install a unauthenticated package or removing an essential package occurs then apt-get will abort. Configuration Item: APT::Get::Assume-Yes.

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There is a unix command called

yes

Without options it outputs the string "y" repeatedly until killed.

To use it, simply pipe the result to the command where you need the confirmations:

yes | apt-get install ...

Read more in the Unix man pages or in the SO post The “yes” command.

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You can add -y To any library install to answer yes

Eg : apt-get install -y nodejs

Eg : apt-get install -y gnupg