pv: pv (Pipe Viewer) pv: pv: It's a terminal-based tool for monitoring the progress of data through pv: a pipeline. It can be inserted into any normal pipeline between two pv: processes to give a visual indication of how quickly data is passing pv: through, how long it has taken, how near to completion it is, and an pv: estimate of how long it will be until completion. pv: pv: pv: pv: