Add Use The Readline Keybindings Anywhere as a Unix TIL

unix/use-the-readline-keybindings-anywhere.md

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+# Use The Readline Keybindings Anywhere
+
+There are these features of the "shell" that I've often heard called _emac
+keybindings_. These are things like `ctrl-a` (move the cursor to the beginning
+of the line) and `ctrl-e` (move the cursor to the end of the line) that I use
+every single day. There are several others that are in my heavy rotation,
+however, I learned about a couple more reading through [Shell Tricks That
+Actually Make Life Easier (And Save Your
+Sanity)](https://blog.hofstede.it/shell-tricks-that-actually-make-life-easier-and-save-your-sanity/).
+
+These are [Readline
+commands](https://www.gnu.org/software/bash/manual/html_node/Bindable-Readline-Commands.html)
+(or keybindings) which means they are supported by anything that uses Readline
+under the hood. So while you might be using these to great effect in `bash` and
+`zsh`, you should look for other places they are available.
+
+A non-exhaustive list includes:
+
+- Ruby's `irb`
+- `python`
+- Node.js' `node`
+- PostgreSQL's `psql`
+
+And many more similar REPLs and command line tools.
+
+Try these keybindings out in one of your favorites and when you're done hit
+`ctrl-c` to exit out of it.