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$ yum install srm
$ srm myfile.txt

srm removes each specified file by overwriting, renaming, and truncating it before unlinking.
This prevents other people from undeleting or recovering any information about the file from the command line.

Instead of just overwriting your files with random data, it uses a special process – a combination of random data, zeros, and special values developed by cryptographer Peter Gutmann – to really, really make sure your files are irrecoverable.