pv: Progress Bar for md5sum et al.

February 4, 2009

Tools that know they will take a long time often come with a built-in progress indicator, but there are other utilities on Linux that often leave the user frustratedly tapping their fingers, wondering how much longer they will have to wait.

Luckily, there is a nifty little tool called pv that will donate a progress bar to any program that can read from standard input or a pipe. pv probably stands for pipe viewer.

1. Simple example: figure out how long an md5sum will take:

pv eternal.avi |md5sum

will display something like

96.5MB 0:00:05 [25.3MB/s] [=======>                                    ]  9% ETA 0:00:48

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