Rename a Group of Files in Yoesmite

In previous OSX, you need to use Automator to help you to change the name file of a group of files.

But in Yoesmite,
you can easily do it by Finder.
1. Highlight all your files.
2. Right-click and select "rename items"
3. A select "format" dropdown to apply a new nomemnclature to the whole list.

Re-size Your Windows in Yosemite

In Yoesmite,
If you click the green button, it will make your current windows expands to full screen.

But you just want the "old" way, how to do it ?

You just need to hold down the option key when clicking green button.