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… that tell your terminal emulator that a slow operation is going on and what the progress currently is.

The ANSI sequences for this are commonly used on Windows, where the new Windows Terminal implements them and paints a pretty little spinner on your terminal tab when they are issued. On Linux terminals the sequence is so far mostly ignored, but maybe it's time that changes? I think it's a truly useful feature because it can communicate progress information about slow operations to the user…