$ apt-get install pv (or, yum install pv)
$ dd if=/dev/zero bs=4096 | pv -s 2G | of=/tmp/file
(這裡的 -s 2G 取代 count=524288)
$ apt-get install dcfldd (or, yum install dcfldd)
$ man dcfldd
$ dcfldd if=/dev/zero bs=4096 of=/tmp/file count=524288 statusinterval=1
$ time dcfldd if=/dev/zero bs=4096 of=/tmp/file count=524288 statusinterval=1