Add Go Back To The Previous Window as a vim til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_785 TILs and counting..._
+_786 TILs and counting..._
 
 ---
 
@@ -802,6 +802,7 @@ _785 TILs and counting..._
 - [From Ruby Variables To JavaScript Variables](vim/from-ruby-variables-to-javascript-variables.md)
 - [Generate and Edit Rails Migration](vim/generate-and-edit-rails-migration.md)
 - [Get The pid Of The Session](vim/get-the-pid-of-the-session.md)
+- [Go Back To The Previous Window](vim/go-back-to-the-previous-window.md)
 - [Go To File With Line Number](vim/go-to-file-with-line-number.md)
 - [Grepping Through The Vim Help Files](vim/grepping-through-the-vim-help-files.md)
 - [Head of File Name](vim/head-of-file-name.md)

vim/go-back-to-the-previous-window.md

@@ -0,0 +1,14 @@
+# Go Back To The Previous Window
+
+When working with multiple files, you may have one or more window splits
+open. You may even be moving back and forth between two in particular --
+perhaps if you are iterating on a test and its implementation. You can move
+back to the previous window using `Ctrl-w Ctrl-w`. This is the same as
+hitting `Ctrl-w w`.
+
+Once you've moved back to the previous window, the window you were just in
+is now the previous window. That means you can keep hitting `Ctrl-w Ctrl-w`
+to toggle back and forth.
+
+See `:h ctrl-w w` for the exact command and `:h ctrl-w` for more on window
+commands.