command + shift + G

command + shift + G is a handy shortcut.
In eclipse IDE, it means search the reference of a method in workspace, which is similar to Control + Option + H.

In mac os x finder, it means go to directory.

A useful usage scenario is as follows:

You look up a java method's references in workspace by typing command + shift + G, then  find an interesting class. You want to share the file to your coworker. So you right click the file, select properties, find the path in location, copy the path.

You then click finder icon or type command + space to open spotlight then type finder to open the finder.

Next you type command + shift + G to invoke "go to directory" UI, then paste the path and type enter. The finder will land on the file you want to send.

You then hightlight the file then drag it into the slack window to share it.