Remember how we can auto complete the bash commands on terminal? and how double tab gives you all available options for a matching pattern? Saves a lot of time typing and searching for a command in Linux and increases your efficiency. It is also possible to do this with the variables, whether env (preset variables) or the custom variables that are initiated by the .bashrc file. To achieve this, simply add these 2 lines in your .bashrc file
shopt -s direxpand
shopt -s cdable_vars