rm does not permanently delete files
Dawson Botsford

Posix Systems has srm (secure rm). Come by default on OSX and you can use your package manager to install it in your *nix distro.
It's implements "7 US DoD compliant passes" (fills the file with zeros 7 times), making recovery extremely expensive (if not, impossible).
I made an alias for rm to use srm by default.

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