Pv (Pipe Viewer) is a command line utility that allows us to monitor the progress of data through a pipe.
It could be used to monitor some long operations performed by utility that not display a progress output (like DD).
With a simple trick, can be used also to display a progress bar and speed monitoring when copying a very large file, with this command:
pv /oldfolder/file > /newfolder/file
Some other usage of PV: