But if you are over a slow network or with huge files, it would be nice to have a progress bar. Sure, you could write your own version of copy, but wouldn’t it be nice to have some more generic options?

ONE WAY
The pv program can do some of the things you want. It monitors data through a pipe or, at least through its standard output. Think of it as cat with a meter. //

There is also progress. It looks around for programs running like cp, mv, dd, and many more, looks at their open files, and shows you progress information for those programs. It only does this once, so you’ll typically marry it with the watch command or use the -M option. //

If you want to add a progress bar to your shell scripts directly, try gum