I had a need for several files of various sizes to do some network testing with.  I found a very good us for dd here.

dd if=/dev/zero of=10mb-file.bin bs=1024k count=n

Using the above command (and replacing n for a value) allows the creation of empty files with the size specificed. Need a 10Mb file, n = 10. Need a 100Mb file… n = 100. You get the idea.

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