Try entering this in a shell:
(use ctrl + C to stop)
What on earth is the point of this program??

will answer yes to "do you want to delete ###" if your rm command is an alias to rm -i etc..

you can use it to answer "yes" automatically, and it saves keystrokes in that before, you had to type:
So, not so useless!

PS: Above commands will empty home directory of currently logged in user.

Is this a contest.......

Try this one:
echo "" | sed "" | more

At least the "yes" command actually DOES something!

I can certainly see testing situations in which this would be exactly what I want, replacing the old Bic Biro top trick (in getting a continuous stream of data down a serial link, you could use this, and that's exactly what you'd want to do when getting two computers to talk to one another while sorting out start bits, stop bits, parity...).

While its also true that I haven't felt the need to do that for years and I've never actually used this command, I'm glad to now know that it exists. Just hope that I remember when I do need it.

Here is a common usage of the yes command that I use routinely:
mv <dir>/file* <dest_dir>/ -i < <(yes n)
cp <dir>/file* <dest_dir>/ -i < <(yes n)

This will prevent overwriting files in the destination without having to manually enter "n".