Upgrading to Ruby 2.0, overwrite executables without prompt

Question

When upgrading from ruby 1.9.3 to ruby 2.0 on linux (at least 12.04) you get an unexpected prompt.

rdoc's executable "rdoc" conflicts with /path/bin/rdoc
Overwrite the executable? [yN]  

It works fine to overwrite it manually but I'm looking for a way that my scripts will auto reply yes without halting.

Just found this issue on rubygems from a year ago. I'm using gem install in a script so I think I can somewhat easily add yes | gem install

Edit: Tried yes | gem install rdoc but it fails with:

ERROR:  Error installing rdoc:
"rdoc" from rdoc conflicts with /usr/local/rubies/2.0.0-p0/bin/rdoc

Answer 1

You can prepend

 yes |

yes just enters y over and over again, which gets piped to to standard input.

(thanks @adamdunson)

Answer 2

--force worked for me:

gem install --force rdoc

Disclaimer: this is not what --force is for, and I don't know why yes | doesn't work.