To Delete a File or Folder Permanently
When you delete a file permanently, it cannot be recovered (unless you have a backup mechanism.)
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Open the Trash Can.
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Select the objects you want to empty from the Trash Can.
Select individual objects, or choose Select All from the File menu.
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Choose Shred from the File menu or from the object's pop-up menu (displayed by pressing Shift+F10 or mouse button 3).
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Click OK in the confirmation dialog box.