how to Securely delete files

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http://www.linuxforums.org – Hi all, It is possible to make a system setting somewhere or install code so that when a file is deleted or moved, regardless of how, ie: using any means a shell cmd or a desktop application, the file is securely deleted? I typically use gnome desktop and when I delete a file I want to know for certain it has been deleted, erased, all data gone... etc. While I am aware of shred, it's cmd line only and doesn't apply to my question. I want to have any file that is being deleted or moved to wipe the source disk areas. (HowTos)