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Comment by kylek | Hacker News Reader

I was thinking it was SIGINFO, but this reminded me of the SIGUSR1 trick to get the current status of a running dd process-

  $ dd if=/dev/zero of=/dev/null& pid=$!
  $ kill -USR1 $pid; sleep 1; kill $pid
  
  18335302+0 records in 18335302+0 records out 9387674624 bytes (9.4 GB) copied,  34.6279  seconds, 271 MB/s

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That's interesting. I always wonder how people monitored the progress of dd before it added the status option.

Now you can use the status option to get a realtime update of the progress.

dd if=/dev/urandom of=/dev/null status=progress

It is siginfo on BSDs, sigusr1 is the fallback.

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