Clone USB pen drives with dd

Cloning a USB pendrive to another is easy ... in linux ...

use blkid to find the two drives
example output :

        origin = /dev/sdd
        destination = /dev /sde

the command is :

        dd if=/dev/sdd of=/dev/sde bs=4M

to see dd's progress, find the pid of dd (in another terminal)

    ps -a | grep dd

add a 10 second timer to ask dd how it's doing ... (in another terminal)

    watch -n 10 kill -USR1 {pid of dd}

and dd will spit out it's progress ... easy!

excerpts from : http://linuxcommando.blogspot.pt/2008/06/show-progress-during-dd-copy.html

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