In the previous versions of Mac OS X you can securely delete files. I found this very handy for certain financial documents that I wanted to remove without the risk of having anything left behind should my Mac become compromised or stolen. Normally this would be accessed from Finder > Securely Empty Trash or right clicking on the Trash Dock icon and selecting Secure Empty Trash. This has been removed in the latest version of Mac OS due to a security venerability, but there is a method of doing this with Terminal.
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