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every 1sec sends DD the USR1 signal which causes DD to print its progress.
There are 2 alternatives - vote for the best!
Sends the "USR1" signal every 1 second (-n 1) to a process called exactly "dd".
The signal in some systems can be INFO or SIGINFO ...
look at the signals list in: man kill
If you can do better, submit your command here.
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On BSD systems the signal to send is SIGINFO (in place of SIGUSR1). This is the signal generated when you press Ctrl-T. When the Gnu/Linux folks copied this feature from BSD, they changed the signal to SIGUSR1 because Linux doesn't have SIGINFO.
It's better to do
while killall -USR1 dd; do sleep 1; donebecause then the while loop stops if there is no dd process any more.