Extend the pipeline

[MHenderson]

Eventually it would good to show how to generate the colouring and then pipe it into the gvpr colour program.

A first step would be to pipe the colouring string. I think it might be necessary to use the read command to assign that string to a variable so that the value can be used in the right place.

https://unix.stackexchange.com/questions/338000/bash-assign-output-of-pipe-to-a-variable#365222