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the speed is about 500MB/s on my machine.
i think it's fast enough to output not too many bytes.
while a C program may output 1GB per sencond on my machine.
if the size is not the power of 512,you may change the bs and count in dd.
There are 6 alternatives - vote for the best!
I'm both a one-liner fan and a haskell learner
If you can do better, submit your command here.
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