Instead of digging into the arcane incantations of bash or fish syntax, just make a portable script that works across both, and lets you use all the goodies that Ruby has to provide!
If you copy-pasta and clone it into this dir in your home folder...
git clone https://github.com/jteneycke/yoso.git ~/scripts
...the first time you run it, it will add itself to the PATH in your shell!
cd ~/scripts
./yoso
Then you can call it from anywhere...
/anywhere/in_your/filesystem $ yoso get-cats
... and it will automatically open up a fresh script template in your favorite EDITOR.
#!/usr/bin/env ruby
require "pry"
require "fileutils"
# A multi-line string area to call bash
BASH = <<-SH
echo "YOSO - You Only Script Once."
SH
system(BASH)And it's already chmod +x'd, in your PATH and ready to run!
I recommend opening up another terminal in a split, keeping your freshly baked script open in your editor, and liberally noodling back and forth between the two as you experiment REPL-styles. (Take that Emacs!)
(just-kidding
(its-actually
(my (favorite))))P.S. - It's also great for copying sketchy-one-off-gists-for-mass-renaming-files-with-bash and having that indecipherable kludge executable on your system as fast as you can say it's "fresh OS install time anyway".