what is '-y' in RUN apk -update -y

Question

what is '-y' in RUN APK -update -y Can we use the command without -y

I am using RUN apk update && apk upgrade in my code

Can I use the command without a -y

Answer 1

Yes!

RUN Command is used when you use Dockerfile to execute a command inside the particular container.

what is '-y' in RUN apk -update -y

Well -y as @kristian said is not found in apk man page, to be precise in alpine. Maybe it was apt update -y or apk update as apt comes in all Debian based flavors.

From the results of running 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.  

Can I use the command without a -y

Yes! If you run commands without the -y option, you need to answer to all prompts that you get from that command interactively in order for the execution of the command to continue.