Add 22: "Literate Ruby"

Author: janlelis

source/posts/22-literate-ruby.html.md

@@ -0,0 +1,35 @@
+---
+title: Literate Ruby
+date: 2015-05-22
+tags: cli-options
+---
+
+Ruby has a built-in feature that is much like [Literate CoffeeScript](http://coffeescript.org/#literate). In contrast to it, this Ruby option will not ignore literature, but garbage:
+
+ARTICLE
+
+## `-x[directory]`
+
+    Tells Ruby that the script is embedded in a message.
+    Leading garbage will be discarded until the  first line
+    that starts with “#!” and contains the string, “ruby”.
+    Any meaningful switches on that line will be applied.
+    The end of the script must be specified with either EOF,
+    ^D (control-D), ^Z (control-Z), or the reserved word
+    __END__.  If the directory name is specified, Ruby will
+    switch to that directory before executing script.
+
+Awesome!
+
+<pre>
+#! Let's see this in action, using this blog post about ruby
+puts "Idiosyncratic Ruby"
+__END__
+</pre>
+Paste the whole content of this article into a file and execute it with:
+
+    $ ruby -x FILENAME
+
+## Further Reading
+
+- `man ruby`