How to destroy all the data from server for decommission?

Solution Verified - Updated -

Issue

  • There are servers about to be decommissioned, how do I delete all of the data securely?
  • How do I remove/delete a file securely?
  • How to securely delete a file so that it cannot be read
  • How to wipe out the complete data and OS in the RHEL 5.9

Environment

  • Red Hat Entreprise Linux (RHEL) 4.8 and later
  • Red Hat Entreprise Linux (RHEL) 5
  • Red Hat Entreprise Linux (RHEL) 6
  • Red Hat Entreprise Linux (RHEL) 7

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