interm: add missing pages from @tomazj

git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@292 a672b425-5310-4d7a-af5c-997e18724b81

site/pages/cmd/interm/chsh.html

@@ -6,7 +6,7 @@ author: Joy Albertini
 tags: directory user shell
 title: chsh
 previous-page: pages/cmd/interm/chroot.html
-next-page: pages/cmd/interm/curl.html
+next-page: pages/cmd/interm/cowsay.html
 ---
 
 The <code>chsh</code> command can be used to change the following user's login shell properties:

site/pages/cmd/interm/cowsay.html

@@ -0,0 +1,47 @@
+---
+layout: page
+category-page: intermediate
+category-title: Intermediate commands
+tags: cow print say dragon lolcat
+author: Joao Tomazoni
+title: cowsay
+previous-page: pages/cmd/interm/chsh.html
+next-page: pages/cmd/interm/curl.html
+---
+
+<code>cowsay</code> is a entertainment command, however it's not guaranteed that your terminal is
+going to have this command available as default. It most likely won't, however you can download
+it yourself using a package manager like <a href="https://brew.sh">brew.sh</a>.<br>
+
+<pre>
+cowsay "Hello there"
+</pre>
+
+Very useful wouldn't you agree?
+You can also pipe commands like ls with cowsay, for example:
+
+<pre>
+ls | cowsay
+</pre>
+
+It returns the cow saying the list of files in the current directory.<br><br>
+
+<h3>Flags</h3>
+
+<b>-f</b> if you aren't satisfied with the cow, you have other possibilities of
+animals instead of cow. One example is the dragon which you can get by using "-f dragon",
+it will now draw a fantasy-like dragon.
+
+<pre>
+cowsay -f dragon "Burn World"
+</pre>
+
+There are more animal drawings for the cowsay command, just type cowsay -l in your terminal for
+the list of the animals you can use.<br><br>
+
+<h3>Suggestion: combine with <code>lolcat</code></h3>
+
+<code>lolcat</code> is another entertainment command that is also installed with the brew pack you
+installed previously for the <code>cowsay</code> command, and they work perfectly together.
+Adding lolcat at the end of the cowsay command and its quote will add random colours for the
+drawing.

site/pages/cmd/interm/curl.html

@@ -5,7 +5,7 @@ category-title: Intermediate commands
 tags: curl download http client crawler request online
 author: Claudio Maggioni
 title: curl
-previous-page: pages/cmd/interm/chsh.html
+previous-page: pages/cmd/interm/cowsay.html
 next-page: pages/cmd/interm/fg.html
 ---
 The <code>curl</code> command is a fast and versatile shell program that can

site/pages/cmd/interm/sudo.html

@@ -0,0 +1,58 @@
+---
+layout: page
+category-page: intermediate
+category-title: Intermediate commands
+tags: super user admin execute root
+author: Joao Tomazoni
+title: sudo
+previous-page: pages/cmd/interm/strings.html
+next-page: pages/cmd/interm/sync.html
+---
+
+<code>sudo</code> stands for <i>Substitute User DO</i> or <i>SuperUser DO</i>.<br>
+It's a powerful command that you must handle with great care.
+If you are a member of the proper group and have permission to do sudo
+commands than you can execute commands as if you were the root user.
+
+Say you're an administrator in the users folder, and you would like to see a subfolder
+inside the home folder from another user named Nate, you may attempt to use the command:
+<code>ls -lr Nate</code>, but you will come by a whole bunch of permissions denied messages,
+this happens because even-though you're an administrator, you don't
+have the rights or permissions to get inside of Nate's home folder and look
+inside those subfolders.
+That's where the sudo command comes in:
+
+<pre>
+ls -lr Nate
+</pre>
+
+Returns denied access messages. To fix this, proceed to add sudo before the
+previously inserted command:
+
+<pre>
+sudo ls -lr Nate
+    Password: (type the local administrator password)
+</pre>
+
+Now, Instead of the denied messages now you actually get a listing of all those subfolders
+in Nate's home folder. So you can execute commands temporarily as if you were the root user,
+which can do absolutely anything on the system. It's is very powerful to troubleshooting
+or fixing problems.<br><br>
+
+<h3>Flags</h3>
+
+<b>-s</b>: If you're going to execute a lot of commands with sudo, you can go inside
+the root shell using the flag <code>-s</code>,
+so that you won't need to keep typing sudo over and over again.
+By typing whoami command after typing <code>sudo -s</code> should return you "root".
+This is what it look likes:</p>
+
+<pre>
+sudo -s
+Password: (type the local administrator password)
+whoami
+    root
+</pre>
+
+Remember, with great power comes great responsibility, be careful with sudo commands.<br>
+<img src="https://imgs.xkcd.com/comics/sandwich.png" alt="xkcd 146">

site/pages/cmd/interm/sync.html

@@ -5,7 +5,7 @@ category-title: Intermediate commands
 tags: sync disk write completion
 author: Gianmarco De Vita
 title: sync
-previous-page: pages/cmd/interm/strings.html
+previous-page: pages/cmd/interm/sudo.html
 next-page: pages/cmd/interm/tar.html
 ---
 <p>

site/pages/fs/touch.html

@@ -6,6 +6,7 @@ tags: directory list create new file
 author: Mattia Hijman
 title: touch
 previous-page: pages/fs/rm.html
+next-page: pages/fs/zip.html
 ---
 
 The <code>touch</code> command updates the modification and access time of the a file.

site/pages/fs/zip.html

@@ -0,0 +1,49 @@
+---
+layout: page
+category-page: fs
+category-title: FileSystem
+tags: compress file directory extract
+author: Joao Tomazoni
+title: zip
+previous-page: pages/fs/rm.html
+---
+
+<code>zip</code> is the command to package and compress files together as .zip extension.
+Simply type zip + name of the zip file + name of the files to be compressed as .zip.
+
+<pre>
+zip -r [target.zip] [source1] [source2]
+</pre>
+
+Say you want to compress a file named test.txt and an image named image.png together
+in one zip file named test.zip. This is what it should look like:
+
+<pre>
+zip -r test.zip text.txt image.png
+</pre>
+
+In this case it should return a test.zip file in your desktop with a directory inside
+containing the two files together.<br><br>
+
+<h3>Flags</h3>
+
+<ul>
+    <li><b>-e</b>: create zip files that require a password in order to be uncompressed.
+<pre>
+zip -e test.zip text.txt image.png
+    Enter password: (password required to unzip the file)
+</pre>
+    </li>
+    <li><b>-u</b>: update zip files and add new files inside the current zip file.
+<pre>
+zip -u test.zip newtext.txt
+</pre>
+        The newtext.txt file will be added to the current test.zip file.
+    </li>
+    <li><b>-d</b>: remove files inside the current zip file.
+<pre>
+zip -d test.zip newtext.txt
+</pre>
+        The newtext.txt file will be removed from the current test.zip file.
+    </li>
+</ul>