pv : a pipe viewer with a progress bar

I have been looking for a while for a special tool which displays the progress done by a process.
I eventually found the right program to do that job : pv

To install it :

root@localhost:~# apt-get install pv

To test it, here is an example to see how fast your computer reads from /dev/zero :

fool@localhost:~$ pv /dev/zero > /dev/null
 228GO 0:03:08 [1,43GO/s] [                      <=>                                                                       ]

More information about its options : man pv

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