Wipe and erase files completely without any traces from Unix and Mac OSX file systems

Generally, running (evtl. more options like bigger blocks (e.g. bs=131072) to run faster?):

dd if=/dev/null of=/<mountpoint>/nullfile
rm /<mountpoint>/nullfile

should do on unix-like oses (incl. Mac OSX).

(Of course remove all files first:)

rm -rf /<mountpoint>/

Mac OSX has a version of srm (secure remove) installed.

srm --help

Linuxes usually have installed shred from GNU coreutils.

Also see File wipe article at infoanarchy.org.

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