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How do I completely wipe my hard drive in Ubuntu?

Usually Linux users use the command rm to remove files and directories. When we remove a file using the command rm we are labeling the removed file or directory as "rewritable space" on the disk. In this tutorial 5 tools to carry out a full removal of data, wipe, srm, dd, shred and scrub are shown. The programs can be executed from live cd distributions to wipe the hard drive completely.