Show hidden files

Hello everybody,

Simple task. I would like to see hidden files & folders on my drive.

I have been using code like this:

defaults write com.apple.finder AppleShowAllFiles -boolean true ; killall Finder

It worked fine when I was using OS X 10.6.8.
Today I upgraded OS to 10.10 Yosemite and this code does not work.

I searched over the internet, even tried every combination that came across my eyes, but non of it worked.

Does anybody know how to do this on Yosemite?

Thanks for your help.