Allows you to "pause" a shell pipeline to interactively select a subset of lines to proceed with. I've always wanted a tool like this, as it effectively combines the best of shell pipes (easy to automate) and visual file managers (easy to make selections). Now that I have it I can't believe a tool like this is not already part of the standard set of shell utilities. There are so many situations where it is useful.Tested on Linux but should also work on MacOS.
Also: please help me come up with a better name!