team advanced: added file pipes.html

git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@100 a672b425-5310-4d7a-af5c-997e18724b81

site/pages/cmd/advanced/pipes.html

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+---
+layout: page
+topic: The pipes command
+author: Domenico Votta
+category_title: Advanced Commands
+category_page: Advanced
+tags: pipes
+title: pipes
+---
+
+<p>The <code>pipes</code> that in the shell are representend with the symbol | , they are used to join two commands on the terminal, taking the output of the first command and using it as input of the second. </p>
+<p> It is usually common to see the command grep and ps together, an example below.</p>
+
+{% highlight ruby linenos %}
+ps aux | grep user
+{% endhighlight %}
+<p>Lists all processes with your username</p>
+
+{% highlight ruby linenos %}
+cat example1.txt | nl
+  1  Car
+  2  Computer
+  3  Robot
+  4  Smartphone
+  5  Videogame
+{% endhighlight %}
+<p>In this example you send this output to another process, in this case, the <a href="nl.html">nl</a> </p>
+
+<p>You can use the commands that you learned and put them together, always respecting the logic of the command.</p>