What is the -y flag used for in apt-get install? [closed]

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What does the -y flag do when you're running apt-get install?

Example, from https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions:

sudo apt-get install -y nodejs

回答1:

It skips the confirmation of the installation. When you install a package, Ubuntu asks for confirmation (Y/N). With -y, Ubuntu does not ask.

来源：https://stackoverflow.com/questions/36873361/what-is-the-y-flag-used-for-in-apt-get-install