The Command key for Mac is located on the edge of the space and is part of many of the keyboard shortcuts for OS X systems. However, command himself can do a lot of things to help users better in OS X to complete the tasks, the following is the command key 5 hidden features. This tutorial is provided by Gguo, a veteran user who can ignore it.
1: Open the Finder Sidebar in a new window by command+ click on the item
Click on the Command key and then tap any item on the Finder sidebar so you can open it in the New Finder window. This action can be applied to any sidebar item, including favorites, shares, and devices. This feature is useful when we want to copy or move files between two windows.
2:command+ mouse drag and drop can move the rear window without affecting the front window
Want to see the window in the background, but don't want to lose control of the front window? It can be achieved by command+ drag and drop.
3:command+ Click the icon on the Dock to open the app's location in the Finder
To know where the app on the Dock is stored in the OS X file system, just command+ click. This feature is not limited to applications, as long as the contents of the OS X Dock are available, including documents, folders, and so on.
4:command+ return search results in Spotlight can be viewed directly in the Finder
As with the Dock operation, when you use Spotlight search, you can open the location of the files in the search results by simply command+ enter. The direct carriage return will open the file.
5: Use Command key to select nonadjacent files
When a user wants to select multiple nonadjacent files, you can do so by holding Command and then selecting the implementation. I believe that the last one to know more users.
Mac Getting Started Tutorial: Command key 5 hidden features