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"killall -USR1 dd" does not work in OS X for me. However, sending INFO instead of USR1 works.
Stops when the (last) dd process exits.
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.
Check the status of a 'dd' in progress. useful when creating very large dumps and want to see how far along it is. Sending the kill -USR1 forces dd to dump it's progress to stdout
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