pv - very useful to put in the middle of a series of piped commands to provide feedback on what, if anything, is happening. I could've used this many times to

pv - very useful to put in the middle of a series of piped commands to provide feedback on what, if anything, is happening. I could've used this many times to catch cases where the amount of work being performed didn't match my expectations; usually an indication of an incorrect assumption or mistake I had made. Instead I sat there waiting for something way longer than I should've, only because I had a bad feedback loop.