With macOS Catalina, the setup instructions state to add the following path to your shell config
echo ‘export PATH="/usr/local/opt/ruby/bin:$PATH"’ >> ~/.bash_profile

Since zsh, Apple has renamed their config the .bash_profile to .zprofile

Should the shell config be:
echo ‘export PATH="/usr/local/opt/ruby/bin:$PATH"’ >> ~/.zprofile


If you’ve setup ZSH as your default shell then do that. ZSH won’t see the bash files.

I actually don’t use the profile files and just add to my .zshrc and .bashrc files.
I actually add to a .commonrc file which gets read by both the other two