Anyway, I put together a little piece of
zshrc to show my current status in right-hand prompt – a prompt that’s shown right-aligned in the shell. Zsh has a couple of features that make this really easy.
prompt_subst options instructs the shell to do variable substitution when evaluating prompts. So if you were to set your prompt to
'$PWD> ' then your prompt would contain your current directory. Of course you wouldn’t do it that way,
%~ does that much more nicely, but that takes us to Zsh’s second feature, ridiculously powerful variable substitution and expansion. In my prompt I just use the simple
$(shell-command) substitution, but there’s a full complement of file-io, string manipulation and more to be had.