Ever wondered how many bytes of space are there left to transfer while doing a dd with a large image ?
Well, dd has a built-in trick in order to help you doing this.
Right from its man page, introducing now the magic :
Sending a USR1 signal to a running `dd’ process makes it print I/O statistics to standard error and then resume copying.
$ dd if=/dev/zero of=/dev/null& pid=$!
$ kill -USR1 $pid; sleep 1; kill $pid18335302+0 records in 18335302+0 records out 9387674624 bytes (9.4 GB) copied, 34.6279 seconds, 271 MB/s
Pretty neat, huh ?
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