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How to empty a file on Linux and Mac

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Quite recently, I had to clear up some space on my machine and was going through the clean-up procedure. A software took some time which I had some tea and t...

How much data has dd written?

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Well, I was trying to write a DVD image of openSUSE to my USB drive using my Mac and since dd is more or less of a silent tool and does not tell you how much...