Pipe Viewer is one of those little-known gems that once you find it, you can't recall how you lived without it. You may find some applications of
pvin your daily command-line use, but you are likely to find oodles of uses for it in your automation scripts. Rather than stare at a blinking cursor waiting patiently for some indication that all is well, you can now insert a probe to give you real-time feedback. Pipe Viewer adds a heartbeat to the soul of the machine.