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pv allows a user to see the progress of data through a pipeline, by giving information such as time elapsed, percentage completed (with progress bar), current throughput rate, total data transferred, and ETA. (man pv)
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This is a more accurate way to watch the progress of a dd process. The $DDPID=$! is needed so that you don't get the PID of the sleep. The sleep 1 is needed because in my testing at least, if you run kill -USR1 against dd too quickly, it will kill it off instead of display the status. So you need to wait a second, probably so that it can configure itself to trap the USR1 signal.
The following command will clone usb stick inside /dev/sdc to /dev/sdd
Double check you got the correct usb sticks (origional-clone)with fdisk -l.
Requires the dc3dd package - available at http://dc3dd.sourceforge.net
forgot to use a pv or rsync and want to know how much has been copied.
If you can do better, submit your command here.
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