-y在apt-get -y install命令中是什么意思？

我总是看到这样的命令

apt-get -y install 

什么是-y标签的，是什么样的区别apt-get install有和没有-y标记？

从运行结果 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.  

如果您运行不带该-y选项的apt-get命令，则需要以交互方式回答从该命令获得的所有提示，以便继续执行该命令。