for ex: if I do like
sudo apt-get upgrade
Then I might get the y/n question before installing an update. What's the parameter to auto accept it.
There are two ways to do this:
$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. [...] --force-yes Force yes; this is a dangerous option that will cause apt to continue without prompting if it is doing something potentially harmful. It should not be used except in very special situations. Using force-yes can potentially destroy your system!
$man yes yes - output a string repeatedly until killed [...] DESCRIPTION Repeatedly output a line with all specified STRING(s), or 'y'.
yes can't know anything about
apt-get internals, it is probably equivalent to
--force-yes and thus dangerous. If you still want to do it, you pipe the output of
yes | apt-get update