Bash Specific

I would like each directory to control a specific application. Duplicating the
configuration lines and have them go out of sync rather than muddy up the
"configurations" with "logic" that needs to be executed to select the correct
configuration.  Often the code for the logic can differ from shell to
shell so you can end up with a trail of tears as you try to logic your
way around the easy choice of duplicating the files based on the
different shell.