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"killall -USR1 dd" does not work in OS X for me. However, sending INFO instead of USR1 works.
Sends SIGINFO to the process. This is a BSD feature OS X inherited. You must have the terminal window executing dd selected when entering CTRL + T for this to work.
While a dd is running in one terminal, open another and enter the while loop. The sample output will be displayed in the window running the dd and the while loop will exit when the dd is complete. It's possible that a "sudo" will need to be inserted before "pkill", depending on your setup, for example:
while pgrep ^dd; do sudo pkill -INFO dd; sleep 10; done
Stops when the (last) dd process exits.
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