Oddbean new post about | logout
 It looks like HOSTNAME is something Bash provides but not a standard environment variable. ZSH and Fish doesn’t have it.  
 ohhh 
 Ugly hack it is.

let
  hostname = builtins.readFile ./whereami;
  hostConfigPath = ./${hostname};
  hostConfig = if builtins.pathExists hostConfigPath
                 then import hostConfigPath
               else {};
in