% del *
Remove file1? y
Remove file2? y
   ...

If you answer y, then the file will be deleted.

What if you want to run a command that will ask you 200 questions and you want to answer y to all of them, but you don't want to type all those y s from the keyboard? Pipe the output of yes to the command; it will answer y for you:

% yes | del *
Remove file1?
Remove file2?
   ...

If you want to answer n to all the questions, you can do:

% yes n | del *