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every 1sec sends DD the USR1 signal which causes DD to print its progress.
There are 3 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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