CentOS使用pv(Pipe Viewer)命令查看执行进度
官方网站：http://www.ivarch.com/programs/pv.shtml
pv - Pipe Viewer - is a terminal-based
tool for monitoring the progress of data through a pipeline. It can be
inserted into any normal pipeline between two processes to give a visual
indication of how quickly data is passing through, how long it has taken,
how near to completion it is, and an estimate of how long it will be until
completion.
Additional support is available for multiple instances working in tandem, to given a visual indicator of relative throughput in a complex pipeline:
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