Using `shred` from the command line

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http://superuser.com – I need to securely erase some files. I have used shred on linux systems before, so I looked around and found that shred is part of the coreutils package in macports. I did port install coreutils to install coreutils, but I still can't find shred in the command line. How can I get shred to work on my mac's command line? If it matters, I'm using Mac OS X 10.7.5 (Lion) (HowTos)