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Feb 4, 2011 at 8:23 comment added maxschlepzig @Rup, yes, the sub-shell - created via the parentheses - provides a stdin file descriptor and both dd calls successively consume the input from it. Yeah - Marco beat me by 29 seconds :)
Feb 4, 2011 at 0:36 comment added Rup Thanks - I didn't know piped input continued to a second process like that, I guess that's the sub shell? I'll definitely remember that! I've given Marco the tick because he got here first but +1 and thanks for the answer!
Feb 3, 2011 at 22:09 history answered maxschlepzig CC BY-SA 2.5