[TriLUG] Changing slashes to backslashes in prompt

[Aaron Schrab via TriLUG]

At 18:07 -0400 19 Apr 2019, Mike Viscount via TriLUG <trilug at trilug.org> wrote:
>I use the ${} syntax often as it's good practice and often quotes also 
>to prevent weird things from happening ... but as far as needing to be 
>upper case inside them - don't think so ... just any variable and they 
>can be upper, lower, mixed, ... etc.

Yeah, I was just trying to differentiate there between PWD the 
environment variable and pwd the command. The contents of ${} can 
certainly be any variable (or even potential variable if set -u isn't 
being used), but the standard variables tend to be in all upper case.
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