Add Watch This Run Repeatedly as a zsh til.

README.md

@@ -69,6 +69,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Clear The Screen](zsh/clear-the-screen.md)
 - [Killing A Frozen SSH Session](zsh/killing-a-frozen-ssh-session.md)
 - [Search History](zsh/search-history.md)
+- [Watch This Run Repeatedly](zsh/watch-this-run-repeatedly.md)
 - [Where Are The Binaries?](zsh/where-are-the-binaries.md)
 
 ## About

zsh/watch-this-run-repeatedly.md

@@ -0,0 +1,16 @@
+# Watch This Run Repeatedly
+
+I usually reach for a quick bash for loop when I want to run a particular
+process a bunch of times in a row. The `watch` command is another way to
+run a process repeatedly.
+
+```
+watch rspec spec/some/test.rb
+```
+
+The default is 2 seconds in between subsequent executions of the command.
+The period can be changed with the `-n` flag though:
+
+```
+watch -n 2 rspec spec/some/test.rb
+```