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Drive clone in Linux with dd

Simple way to clone drives in Linux.

Assume drive sda is the source, and sdb is the destination.

dd if=/dev/sda of=/dev/sdb & PID=$!; which kill -USR1 $PID;

& runs dd in the background.
PID=$! gets the last process id (of the dd command)
Which runs the command every second or two.
Kill -USR1 tells dd to print its progress.

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