Creating Empty Files of Any Size
14.01.07 19:55 | OS X Server
This is again one of those cool things that you could never do with OS 9 or older: 
> dd count=`echo $((1024*1024/512*sizeinmegs))` if=/dev/zero of=myfile.zeros

Perfect for testing drives, networks or file transfer apps.
Update: 
man mkfile

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