OS X Mountain Lion: The Missing Manual

The Trash

No single element of the Macintosh interface is as recognizable or famous as the Trash icon, which appears at the end of the Dock. (It’s actually a wastebasket, not a can, but let’s not quibble.)

You can discard almost any icon by dragging it into the Trash can. When the tip of your arrow cursor touches the Trash icon, the little wastebasket turns black. When you release the mouse, you’re well on your way to discarding whatever it was you dragged. As a convenience, OS X even replaces the empty-wastebasket icon with a wastebasket-filled-with-crumpled-up-papers icon, to let you know there’s something in there.

It’s worth learning the keyboard alternative to dragging something into the Trash: Highlight the icon, and then press ⌘-Delete (which corresponds to the File→Move to Trash command). This technique is not only far faster than dragging, but it also requires far less precision, especially if you have a large screen. OS X does all the Trash-targeting for you.

Figure 2-10. Top: Your last warning. OS X doesn’t tell you how many items are in the Trash or how much disk space they take up. Bottom: The Get Info window for a locked file. Locking a file in this way isn’t military-level security by any stretch—any passing evildoer can unlock the file in the same way. But it does trigger a warning when you try to put it into the Trash, providing at least one layer of protection against ...