gitwipe is an utility for wiping files. It overwrites the file
contents with a random sequence of numbers and then calls `sync'().
Note that gitwipe does *not* delete the file since (under
Linux at least) the `sync'() system call might return before
actually writing the new file contents to disk. Deleting the file might
be dangerous because some file systems can detect that the blocks in the
file are no longer used and never write them back to disk in order to
improve performance. It is up to you to delete the file(s) at a later
moment.
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