Printing dd status

clipped from prefetch.net
The dd utility doesn’t report status information by default, but when fed a SIGUSR1 signal it will dump the status of the current operation:
$ dd if=/dev/zero of=/dev/hda1 bs=512 &
$ kill -SIGUSR1 1749
1038465+0 records in
1038465+0 records out
531694080 bytes (532 MB) copied, 11.6338 seconds, 45.7 MB/s

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