The Julia Pkg documentation tells how to initiate an environment ($ activate $ENV-NAME), but it probably lacks the handy command to switch to the already created special environment. Also, I'm having trouble finding a command that shows all already created environments on the list, hence, if I have forgotten the names of the environments previously created, I need to do a manual search through the Julia-related folders...
So far, the verbatim help command in Julia REPL provides a poor description and so does the related Pkg-documentation webpage.
Another possible general answer to this predicament is to start using the Playground.jl module, which was recommended here on Medium:
However, the direct download attempt with Pkg repeatedly fails since the Pkg isn't able to find the package in the suggested GH project.
Thanks beforehand for any recommendations.