Describe convention about the default value for yes/no prompts

[ibnesayeed]

Many tools follow the convention of upper case letter used for the default value in y/n prompts. I think it is a good and concise way to convey an important aspect.

• apt install shows Do you want to continue? [Y/n] prompt when the disk space requirement is significant. This is a case where the default value is Yes or Y and hitting <enter> without typing anything will continue with installation.
• docker system prune on the other hand has the opposite default and shows the prompt Are you sure you want to continue? [y/N], which means hitting <enter> without typing anything will do nothing.

Is this convention out of scope of the document?

Moreover, we might also want to describe that a yes/no should accept all variations of yes, no, y, and n in case-insensitive manner.

[eqn-group]

I think, continuing with the process is a careful choice and must not be made accidentally. so capital-Y Y should be used for yes, while n be used for no. keep it simple and rigid. and yes, it should must be case-sensitive.