diff --git a/site/_sass/_syntax-highlighting.scss b/site/_sass/_syntax-highlighting.scss
index 3d1f8b5..d43cb87 100644
--- a/site/_sass/_syntax-highlighting.scss
+++ b/site/_sass/_syntax-highlighting.scss
@@ -1,7 +1,7 @@
 /*
  * Syntax highlighting styles
  */
-.highlight, pre, main code {
+.highlight, pre, main pre code {
   background: #bdbdbd;
   color: #212121;
   border-radius: 2px;
diff --git a/site/pages/cmd/advanced/bc.html b/site/pages/cmd/advanced/bc.html
index 04c5af7..db0ca58 100644
--- a/site/pages/cmd/advanced/bc.html
+++ b/site/pages/cmd/advanced/bc.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: calculator sum add substract divide calculate compute
 title: bc
+previous-page: pages/cmd/advanced/bc.html
+next-page: pages/cmd/advanced/colrm.html
 ---
 
 In computing, <code>bc</code> is a command in Unix operating systems that can do easy
diff --git a/site/pages/cmd/advanced/colrm.html b/site/pages/cmd/advanced/colrm.html
index 2f365b0..ce8d746 100644
--- a/site/pages/cmd/advanced/colrm.html
+++ b/site/pages/cmd/advanced/colrm.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: remove column
 title: colrm
+previous-page: pages/cmd/advanced/bc.html
+next-page: pages/cmd/advanced/comm.html
 ---
 The <code>colrm</code> is a command that removes the column that you indicate <br>
 
diff --git a/site/pages/cmd/advanced/comm.html b/site/pages/cmd/advanced/comm.html
index 28a1d64..f28c35f 100644
--- a/site/pages/cmd/advanced/comm.html
+++ b/site/pages/cmd/advanced/comm.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: compare sorted files
 title: comm
+previous-page: pages/cmd/advanced/colrm.html
+next-page: pages/cmd/advanced/diff.html
 ---
 The <code>comm</code> is a command that compares two sorted files
 line by line and writes the output: the lines that are in common and the lines that are unique.<br>
diff --git a/site/pages/cmd/advanced/diff.html b/site/pages/cmd/advanced/diff.html
index ca436ae..65658df 100644
--- a/site/pages/cmd/advanced/diff.html
+++ b/site/pages/cmd/advanced/diff.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: difference lines diff file separating
 title: diff
+previous-page: pages/cmd/advanced/comm.html
+next-page: pages/cmd/advanced/echo.html
 ---
 
 The command <code>diff</code> analyzes two files and prints the lines that are different.
diff --git a/site/pages/cmd/advanced/echo.html b/site/pages/cmd/advanced/echo.html
index f2e72ad..cf94feb 100644
--- a/site/pages/cmd/advanced/echo.html
+++ b/site/pages/cmd/advanced/echo.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: echo print text
 title: echo
+previous-page: pages/cmd/advanced/diff.html
+next-page: pages/cmd/advanced/emacs.html
 ---
 
 In computing, <code>echo</code> is a command in Unix operating systems that outputs the
diff --git a/site/pages/cmd/advanced/emacs.html b/site/pages/cmd/advanced/emacs.html
index 0d86248..12b4657 100644
--- a/site/pages/cmd/advanced/emacs.html
+++ b/site/pages/cmd/advanced/emacs.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: advanced text editor
 title: emacs
+previous-page: pages/cmd/advanced/echo.html
+next-page: pages/cmd/advanced/grep.html
 ---
 
 Emacs is one of the oldest and most versatile text editors available for
@@ -25,13 +27,6 @@ in a Linux system and use it for basic text editing. Emacs
 is also available for graphical window managers, however we will only cover the
 "text based" version here.
 
-<h3>How to install</h3>
-
-Run the following command:
-<pre>
-install emacs
-</pre>
-
 <h3>Open a file, or create it like this:</h3>
 
 <pre>
diff --git a/site/pages/cmd/advanced/grep.html b/site/pages/cmd/advanced/grep.html
index b9ee05f..cc41e4f 100644
--- a/site/pages/cmd/advanced/grep.html
+++ b/site/pages/cmd/advanced/grep.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: search for occurencies
 title: grep
+previous-page: pages/cmd/advanced/emacs.html
+next-page: pages/cmd/advanced/head-tail.html
 ---
 The <code>grep</code>  is a command that permits to search occurences of a
 keyword or more in a file or more. Through some flags you can decide the search criteria.
diff --git a/site/pages/cmd/advanced/head-tail.html b/site/pages/cmd/advanced/head-tail.html
index 3b5af87..2ef58a0 100644
--- a/site/pages/cmd/advanced/head-tail.html
+++ b/site/pages/cmd/advanced/head-tail.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: head tail text file
 title: head and tail
+previous-page: pages/cmd/advanced/grep.html
+next-page: pages/cmd/advanced/nl.html
 ---
 
 The <code>head</code> command reads the first few lines of any text given to it as an input
diff --git a/site/pages/cmd/advanced/nl.html b/site/pages/cmd/advanced/nl.html
index b2a55ed..588a44f 100644
--- a/site/pages/cmd/advanced/nl.html
+++ b/site/pages/cmd/advanced/nl.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: number lines count
 title: nl
+previous-page: pages/cmd/advanced/head-tail.html
+next-page: pages/cmd/advanced/paste.html
 ---
 The <code>nl</code> is a command that permits to number the lines.
 Through some flags you can decide how to filter this command.<br>
diff --git a/site/pages/cmd/advanced/paste.html b/site/pages/cmd/advanced/paste.html
index 45b9aa1..a46f656 100644
--- a/site/pages/cmd/advanced/paste.html
+++ b/site/pages/cmd/advanced/paste.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: filie coluns analize
 title: paste
+previous-page: pages/cmd/advanced/nl.html
+next-page: pages/cmd/advanced/pipes.html
 ---
 
 The <code>paste</code> command is used to join files horizontally
diff --git a/site/pages/cmd/advanced/pipes.html b/site/pages/cmd/advanced/pipes.html
index 259d26f..1cc0a04 100644
--- a/site/pages/cmd/advanced/pipes.html
+++ b/site/pages/cmd/advanced/pipes.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: pipes redirect output input
 title: Pipes
+previous-page: pages/cmd/advanced/paste.html
+next-page: pages/cmd/advanced/tr.html
 ---
 
 The <code>pipes</code> that in the shell are representend with the symbol | ,
diff --git a/site/pages/cmd/advanced/tr.html b/site/pages/cmd/advanced/tr.html
index 449707a..7abc0a0 100644
--- a/site/pages/cmd/advanced/tr.html
+++ b/site/pages/cmd/advanced/tr.html
@@ -5,6 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: translate
 title: tr
+previous-page: pages/cmd/advanced/pipes.html
+next-page: pages/cmd/advanced/vi.html
 ---
 
 The <code>tr</code> command in Unix-like operating systems, which name stands for
diff --git a/site/pages/cmd/advanced/vi.html b/site/pages/cmd/advanced/vi.html
index a50a2c9..716ac7c 100644
--- a/site/pages/cmd/advanced/vi.html
+++ b/site/pages/cmd/advanced/vi.html
@@ -5,7 +5,8 @@ category-page: advanced
 category-title: Advanced commands
 tags: advanced text editor hell quit help escape sos
 title: vi
-
+previous-page: pages/cmd/advanced/tr.html
+next-page: pages/cmd/advanced/wc.html
 ---
 The default editor that comes with the UNIX operating system is called
 <code>vi</code> (visual editor).<br>
diff --git a/site/pages/cmd/advanced/wc.html b/site/pages/cmd/advanced/wc.html
index cbdc213..a8969fc 100644
--- a/site/pages/cmd/advanced/wc.html
+++ b/site/pages/cmd/advanced/wc.html
@@ -5,6 +5,7 @@ category-page: advanced
 category-title: Advanced commands
 tags: word count lines
 title: wc
+previous-page: pages/cmd/advanced/vi.html
 ---
 The program reads either standard input or a list of files and
 generates one or more of the following statistics: newline count,
diff --git a/site/pages/cmd/basic/0-openshell.html b/site/pages/cmd/basic/0-openshell.html
index 7801129..e531eaf 100644
--- a/site/pages/cmd/basic/0-openshell.html
+++ b/site/pages/cmd/basic/0-openshell.html
@@ -5,7 +5,7 @@ category-title: Basic commands
 tags: Open the Shell
 author: Gianmarco De Vita
 title: Open the Shell
-next-page: pages/cmd/basic/terminal-toolbar.html
+next-page: pages/cmd/basic/1-terminal-toolbar.html
 ---
 
 The tool that allows us to interact with the system with the shell is the terminal.
diff --git a/site/pages/cmd/basic/1-terminal-toolbar.html b/site/pages/cmd/basic/1-terminal-toolbar.html
index a369d96..fdea38b 100644
--- a/site/pages/cmd/basic/1-terminal-toolbar.html
+++ b/site/pages/cmd/basic/1-terminal-toolbar.html
@@ -5,8 +5,8 @@ category-page: basic
 category-title: Basic commands
 author: Marzio Lunghi
 title: MacOS terminal toolbar
-previous-page: pages/cmd/basic/openshell.html
-next-page: pages/cmd/basic/closeshell.html
+previous-page: pages/cmd/basic/0-openshell.html
+next-page: pages/cmd/basic/2-closeshell.html
 ---
 
 Once the MacOS Terminal app has been opened, a menu bar will appear exactly in the upper
diff --git a/site/pages/cmd/basic/10-info.html b/site/pages/cmd/basic/10-info.html
index 2b0635a..676628e 100644
--- a/site/pages/cmd/basic/10-info.html
+++ b/site/pages/cmd/basic/10-info.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: manual
 author: Gianmarco De Vita
 title: info
-previous-page: pages/cmd/basic/whatis.html
-next-page: pages/cmd/basic/chown.html
+previous-page: pages/cmd/basic/9-whatis.html
+next-page: pages/cmd/basic/11-chown.html
 ---
 An <i>.info</i> file is an information document created by Texinfo.<br>
 It stores documentation in a book format with chapters, sections,
diff --git a/site/pages/cmd/basic/11-chown.html b/site/pages/cmd/basic/11-chown.html
index a04faa7..cf9b902 100644
--- a/site/pages/cmd/basic/11-chown.html
+++ b/site/pages/cmd/basic/11-chown.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 author: Joy Albertini
 tags: directory file chown  symbolic link
 title: chown
-previous-page: pages/cmd/basic/info.html
-next-page: pages/cmd/basic/mv.html
+previous-page: pages/cmd/basic/10-info.html
+next-page: pages/cmd/basic/12-mv.html
 ---
 
 <p>The <code>chown</code>
diff --git a/site/pages/cmd/basic/12-mv.html b/site/pages/cmd/basic/12-mv.html
index 57a8c7b..115f3f8 100644
--- a/site/pages/cmd/basic/12-mv.html
+++ b/site/pages/cmd/basic/12-mv.html
@@ -5,7 +5,7 @@ category-title: Basic commands
 author: Joy Albertini
 tags: directory path mv file
 title: mv
-previous-page: pages/cmd/basic/chown.html
+previous-page: pages/cmd/basic/11-chown.html
 ---
 
 <p>The <code>mv</code>  move a file from a directory to another:
diff --git a/site/pages/cmd/basic/2-closeshell.html b/site/pages/cmd/basic/2-closeshell.html
index 1a52a30..384ef05 100644
--- a/site/pages/cmd/basic/2-closeshell.html
+++ b/site/pages/cmd/basic/2-closeshell.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: Close shell
 author: Marzio Lunghi
 title: Closing the shell
-previous-page: pages/cmd/basic/terminal-toolbar.html
-next-page: pages/cmd/basic/ls.html
+previous-page: pages/cmd/basic/1-terminal-toolbar.html
+next-page: pages/cmd/basic/3-ls.html
 ---
 If you want to close the shell session, there are several ways to do so:
 
diff --git a/site/pages/cmd/basic/3-ls.html b/site/pages/cmd/basic/3-ls.html
index 6c23b15..b43f2dd 100644
--- a/site/pages/cmd/basic/3-ls.html
+++ b/site/pages/cmd/basic/3-ls.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: directory list
 author: Alessandro Marinelli
 title: ls
-previous-page: pages/cmd/basic/closeshell.html
-next-page: pages/cmd/basic/man.html
+previous-page: pages/cmd/basic/2-closeshell.html
+next-page: pages/cmd/basic/4-man.html
 ---
 The <code>ls</code> command is used to list a directory content or a file.<br>
 The name stands for <i>LiSt</i>.
diff --git a/site/pages/cmd/basic/4-man.html b/site/pages/cmd/basic/4-man.html
index 0221d33..8baaa07 100644
--- a/site/pages/cmd/basic/4-man.html
+++ b/site/pages/cmd/basic/4-man.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: manual
 author: Gianmarco De Vita
 title: man
-previous-page: pages/cmd/basic/ls.html
-next-page: pages/cmd/basic/open.html
+previous-page: pages/cmd/basic/3-ls.html
+next-page: pages/cmd/basic/5-open.html
 ---
 The <code>man</code> tool allows you to explore the various utilities
 of the Shell. To search for more information about a command, just write</p>
diff --git a/site/pages/cmd/basic/5-open.html b/site/pages/cmd/basic/5-open.html
index 156b956..9e183bf 100644
--- a/site/pages/cmd/basic/5-open.html
+++ b/site/pages/cmd/basic/5-open.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: open
 author: Gianmarco De Vita
 title: open
-previous-page: pages/cmd/basic/man.html
-next-page: pages/cmd/basic/more-less.html
+previous-page: pages/cmd/basic/4-man.html
+next-page: pages/cmd/basic/6-more-less.html
 ---
 
 You can open files and folder as new windows through the terminal.
diff --git a/site/pages/cmd/basic/6-more-less.html b/site/pages/cmd/basic/6-more-less.html
index 2c469f3..30ccf7f 100644
--- a/site/pages/cmd/basic/6-more-less.html
+++ b/site/pages/cmd/basic/6-more-less.html
@@ -4,9 +4,9 @@ category-page: basic
 category-title: Basic commands
 tags: More and less
 author: Marzio Lunghi
-title: more and Less
-previous-page: pages/cmd/basic/open.html
-next-page: pages/cmd/basic/clear.html
+title: more and less
+previous-page: pages/cmd/basic/5-open.html
+next-page: pages/cmd/basic/7-clear.html
 ---
 Both commands show the content of one or more files and it’s possible to do a research with
 particular flags, but the “less” one allows us to go also backwards while reading the text
diff --git a/site/pages/cmd/basic/7-clear.html b/site/pages/cmd/basic/7-clear.html
index 46004cb..2105322 100644
--- a/site/pages/cmd/basic/7-clear.html
+++ b/site/pages/cmd/basic/7-clear.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: Clear shell
 author: Marzio Lunghi
 title: clear
-previous-page: pages/cmd/basic/more-less.html
-next-page: pages/cmd/basic/say.html
+previous-page: pages/cmd/basic/6-more-less.html
+next-page: pages/cmd/basic/8-say.html
 ---
 If you want to clear the shell screen up to the start you have to digit
 the <code>clear</code> command:
diff --git a/site/pages/cmd/basic/8-say.html b/site/pages/cmd/basic/8-say.html
index 2023ea3..54ef39f 100644
--- a/site/pages/cmd/basic/8-say.html
+++ b/site/pages/cmd/basic/8-say.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: say
 author: Gianmarco De Vita
 title: say
-previous-page: pages/cmd/basic/clear.html
-next-page: pages/cmd/basic/whatis.html
+previous-page: pages/cmd/basic/7-clear.html
+next-page: pages/cmd/basic/9-whatis.html
 ---
 
 You can convert text into audible speech just by writing the command
diff --git a/site/pages/cmd/basic/9-whatis.html b/site/pages/cmd/basic/9-whatis.html
index fbb9021..7900b94 100644
--- a/site/pages/cmd/basic/9-whatis.html
+++ b/site/pages/cmd/basic/9-whatis.html
@@ -5,8 +5,8 @@ category-title: Basic commands
 tags: Whatis
 author: Marzio Lunghi
 title: whatis
-previous-page: pages/cmd/basic/say.html
-next-page: pages/cmd/basic/info.html
+previous-page: pages/cmd/basic/8-say.html
+next-page: pages/cmd/basic/10-info.html
 ---
 
 The <code>whatis</code> command gives you a brief description of a command.
diff --git a/site/pages/cmd/interm/7z.html b/site/pages/cmd/interm/7z.html
index 4af4c46..85049d1 100644
--- a/site/pages/cmd/interm/7z.html
+++ b/site/pages/cmd/interm/7z.html
@@ -5,6 +5,7 @@ category-title: Intermediate commands
 tags: compress archive extract
 author: Andrea Brites Marto
 title: 7z
+next-page: pages/cmd/interm/apropos.html
 ---
 <p>
 A .7z. file is an archive format that stands for 7-zip. By default, Mac OS X does not
diff --git a/site/pages/cmd/interm/apropos.html b/site/pages/cmd/interm/apropos.html
index 98212e8..2c1a10b 100644
--- a/site/pages/cmd/interm/apropos.html
+++ b/site/pages/cmd/interm/apropos.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 author: Joy Albertini
 tags: search tag apropos keyword
 title: apropos
+previous-page: pages/cmd/interm/7z.html
+next-page: pages/cmd/interm/base64.html
 ---
 
 The <code>apropos</code> command is used to search command in the shell with a keyword,
diff --git a/site/pages/cmd/interm/base64.html b/site/pages/cmd/interm/base64.html
index 4dc4825..35d3497 100644
--- a/site/pages/cmd/interm/base64.html
+++ b/site/pages/cmd/interm/base64.html
@@ -5,8 +5,8 @@ category-title: Intermediate commands
 tags: base64 representation
 author: Gianmarco De Vita
 title: base64
-previous-page:
-next-page:
+previous-page: pages/cmd/interm/apropos.html
+next-page: pages/cmd/interm/basename.html
 ---
 
 <i>Base64</i> is an encoding system that allows the translation of binary
diff --git a/site/pages/cmd/interm/basename.html b/site/pages/cmd/interm/basename.html
index 6a89ef4..8092e28 100644
--- a/site/pages/cmd/interm/basename.html
+++ b/site/pages/cmd/interm/basename.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: basename suffix prefix name
 author: Fabiano Fenini
 title: basename
+previous-page: pages/cmd/interm/base64.html
+next-page: pages/cmd/interm/bash.html
 ---
 The <code>basename</code> command deletes any prefix ending with the last slash "/" character
 present in string and also a suffix.
diff --git a/site/pages/cmd/interm/bash.html b/site/pages/cmd/interm/bash.html
index d192e01..b17da22 100644
--- a/site/pages/cmd/interm/bash.html
+++ b/site/pages/cmd/interm/bash.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: bash shell terminal
 author: Marco Farace
 title: bash
+previous-page: pages/cmd/interm/basename.html
+next-page: pages/cmd/interm/cat.html
 ---
 
 Bash is an sh-compatible command language interpreter that executes commands
diff --git a/site/pages/cmd/interm/cat.html b/site/pages/cmd/interm/cat.html
index 78a1398..2523a6e 100644
--- a/site/pages/cmd/interm/cat.html
+++ b/site/pages/cmd/interm/cat.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: cat content file show concatenate
 author: Fabiano Fenini
 title: cat
+previous-page: pages/cmd/interm/bash.html
+next-page: pages/cmd/interm/chroot.html
 ---
 The <code>cat</code> command can be easily associated to the word “concatenation” but
 it doesn’t have that only function: in fact, cat command gives us the possibility to create
diff --git a/site/pages/cmd/interm/chroot.html b/site/pages/cmd/interm/chroot.html
index ef85bbe..18c5db0 100644
--- a/site/pages/cmd/interm/chroot.html
+++ b/site/pages/cmd/interm/chroot.html
@@ -5,8 +5,8 @@ category-title: Intermediate commands
 tags: change root
 author: Gianmarco De Vita
 title: chroot
-previous-page: pages/cmd/interm/
-next-page: pages/cmd/interm/
+previous-page: pages/cmd/interm/cat.html
+next-page: pages/cmd/interm/curl.html
 ---
 The <code>chroot</code> utility allows you to change its root directory to
 the one indicated in newroot and, if given, executes the command.<br>
diff --git a/site/pages/cmd/interm/curl.html b/site/pages/cmd/interm/curl.html
index 4d3e18c..652b39f 100644
--- a/site/pages/cmd/interm/curl.html
+++ b/site/pages/cmd/interm/curl.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: curl download http client crawler request online
 author: Claudio Maggioni
 title: curl
+previous-page: pages/cmd/interm/chroot.html
+next-page: pages/cmd/interm/fg.html
 ---
 The <code>curl</code> command is a fast and versatile shell program that can
 request online content using various protocols, including <i>HTTP</i>,
diff --git a/site/pages/cmd/interm/fg.html b/site/pages/cmd/interm/fg.html
index 53f9938..d9e08a5 100644
--- a/site/pages/cmd/interm/fg.html
+++ b/site/pages/cmd/interm/fg.html
@@ -5,7 +5,8 @@ category-title: Intermediate commands
 tags: stopped job fg foreground
 author: Fabiano Fenini
 title: fg
-previous-page: ""
+previous-page: pages/cmd/interm/curl.html
+next-page: pages/cmd/interm/git.html
 ---
 The <code>fg</code> command allows us to continue a stopped operation by running it
 in foreground.<br>
diff --git a/site/pages/cmd/interm/git.html b/site/pages/cmd/interm/git.html
index b634cb1..63a13f1 100644
--- a/site/pages/cmd/interm/git.html
+++ b/site/pages/cmd/interm/git.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: versioning commit merge software source code
 author: Andrea Brites Marto
 title: git
+previous-page: pages/cmd/interm/fg.html
+next-page: pages/cmd/interm/ifconfig.html
 ---
 If you want to use <i>Git</i> on the shell you need to know how this command works.<br>
 The <i>git</i> command providesa set of high-level operations and full access to internals.<br>
diff --git a/site/pages/cmd/interm/ifconfig.html b/site/pages/cmd/interm/ifconfig.html
index dc726ce..70bb859 100644
--- a/site/pages/cmd/interm/ifconfig.html
+++ b/site/pages/cmd/interm/ifconfig.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: command ifconfig
 author: Matteo Omenetti
 title: ifconfig
+previous-page: pages/cmd/interm/git.html
+next-page: pages/cmd/interm/install.html
 ---
 
 The command <code>ifconfig</code> stands for <i>Interface CONFIGuration</i>. It is used
diff --git a/site/pages/cmd/interm/install.html b/site/pages/cmd/interm/install.html
index 7381080..00368cd 100644
--- a/site/pages/cmd/interm/install.html
+++ b/site/pages/cmd/interm/install.html
@@ -4,6 +4,8 @@ category-page: intermediate
 category-title: Intermediate commands
 author: Marco Farace
 title: install
+previous-page: pages/cmd/interm/ifconfig.html
+next-page: pages/cmd/interm/kill.html
 ---
 
 The file(s) are copied to the target file or directory. If the destination
diff --git a/site/pages/cmd/interm/kill.html b/site/pages/cmd/interm/kill.html
index 85717ba..66efe75 100644
--- a/site/pages/cmd/interm/kill.html
+++ b/site/pages/cmd/interm/kill.html
@@ -2,9 +2,11 @@
 layout: page
 category-page: intermediate
 category-title: Intermediate commands
-tags: terminate 
+tags: terminate
 author: Announ Marwan
 title: kill
+previous-page: pages/cmd/interm/install.html
+next-page: pages/cmd/interm/md5.html
 ---
 The <code>kill</code> command is used for terminating the
 running processes on your system.<br>
@@ -30,7 +32,7 @@ killall -9 [process name]
 <h3>kill</h3>
 
 Will terminate only one program.
-Without Without options, kill sends SIGTERM to the PID specified and asks the application
+Without options, kill sends SIGTERM to the PID specified and asks the application
 or service to shut itself down.
 
 <pre>
diff --git a/site/pages/cmd/interm/md5.html b/site/pages/cmd/interm/md5.html
index 998e089..5d9ed77 100644
--- a/site/pages/cmd/interm/md5.html
+++ b/site/pages/cmd/interm/md5.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: integrity checksum
 author: Joey Bevilacqua
 title: md5
+previous-page: pages/cmd/interm/kill.html
+next-page: pages/cmd/interm/mount.html
 ---
 
 The command <code>md5</code> calculates an unique string for each input given as
diff --git a/site/pages/cmd/interm/mount.html b/site/pages/cmd/interm/mount.html
index 1547ac7..2757a51 100644
--- a/site/pages/cmd/interm/mount.html
+++ b/site/pages/cmd/interm/mount.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: mount drive umount storage device
 author: Marco Farace
 title: mount
+previous-page: pages/cmd/interm/md5.html
+next-page: pages/cmd/interm/neofetch.html
 ---
 To access a file on a Unix-like machine, the file system that contains it
 needs to be mounted with the <code>mount</code> command. Mount is frequently used for
diff --git a/site/pages/cmd/interm/neofetch.html b/site/pages/cmd/interm/neofetch.html
index 32d7657..2afce37 100644
--- a/site/pages/cmd/interm/neofetch.html
+++ b/site/pages/cmd/interm/neofetch.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: neofetch fetch neo
 author: Marco Farace
 title: neofetch
+previous-page: pages/cmd/interm/mount.html
+next-page: pages/cmd/interm/pass.html
 ---
 
 Neofetch is a fast, higly customizable system info script. a  CLI  system
diff --git a/site/pages/cmd/interm/pass.html b/site/pages/cmd/interm/pass.html
index 09e1904..0121285 100644
--- a/site/pages/cmd/interm/pass.html
+++ b/site/pages/cmd/interm/pass.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: password dashlane keypass manager gpg encrypt sync
 author: Claudio Maggioni
 title: pass
+previous-page: pages/cmd/interm/neofetch.html
+next-page: pages/cmd/interm/passwd.html
 ---
 The <code>pass</code> command, also known as <i>Password Store</i>, is an
 entirely offline password manager that uses <i>GPG</i> for encryption with
diff --git a/site/pages/cmd/interm/passwd.html b/site/pages/cmd/interm/passwd.html
index 1916f74..8acae86 100644
--- a/site/pages/cmd/interm/passwd.html
+++ b/site/pages/cmd/interm/passwd.html
@@ -5,7 +5,8 @@ category-title: Intermediate commands
 tags: password change pwd user
 author: Fabiano Fenini
 title: passwd
-previous-page: ""
+previous-page: pages/cmd/interm/pass.html
+next-page: pages/cmd/interm/ping.html
 ---
 The <code>passwd</code> command allows us to change or to assign a password of authentication
 of an user currently in the system.<br>
diff --git a/site/pages/cmd/interm/ping.html b/site/pages/cmd/interm/ping.html
index 246b8d8..b797208 100644
--- a/site/pages/cmd/interm/ping.html
+++ b/site/pages/cmd/interm/ping.html
@@ -3,8 +3,10 @@ layout: page
 category-page: intermediate
 category-title: Intermediate commands
 author: Joy Albertini
-tags: server ping latency UNIX
+tags: server ping latency
 title: ping
+previous-page: pages/cmd/interm/passwd.html
+next-page: pages/cmd/interm/ps.html
 ---
 
 The <code>ping</code> command, is used to test connection between a <b>local server/computer</b>
diff --git a/site/pages/cmd/interm/ps.html b/site/pages/cmd/interm/ps.html
index 57a4a7a..ddb322b 100644
--- a/site/pages/cmd/interm/ps.html
+++ b/site/pages/cmd/interm/ps.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: process status
 author: Andrea Brites Marto
 title: ps
+previous-page: pages/cmd/interm/ping.html
+next-page: pages/cmd/interm/scp.html
 ---
 
 <p>
diff --git a/site/pages/cmd/interm/scp.html b/site/pages/cmd/interm/scp.html
index cea27cd..56cf563 100644
--- a/site/pages/cmd/interm/scp.html
+++ b/site/pages/cmd/interm/scp.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: ssh copy file secure
 author: Announ Marwan
 title: scp
+previous-page: pages/cmd/interm/ps.html
+next-page: pages/cmd/interm/shasum.html
 ---
 
 The <code>scp</code> command name stands for <i>Secure CoPy</i>.<br>
diff --git a/site/pages/cmd/interm/shasum.html b/site/pages/cmd/interm/shasum.html
index f7e29bb..2fb59d1 100644
--- a/site/pages/cmd/interm/shasum.html
+++ b/site/pages/cmd/interm/shasum.html
@@ -5,8 +5,8 @@ category-title: Intermediate commands
 tags: sha sums check
 author: Gianmarco De Vita
 title: shasum
-previous-page: pages/cmd/interm/
-next-page: pages/cmd/interm/
+previous-page: pages/cmd/interm/scp.html
+next-page: pages/cmd/interm/ssh.html
 ---
 
 With <code>shasum</code> command you can work with SHA Checksums.
diff --git a/site/pages/cmd/interm/ssh.html b/site/pages/cmd/interm/ssh.html
index 75b41ee..2bfb594 100644
--- a/site/pages/cmd/interm/ssh.html
+++ b/site/pages/cmd/interm/ssh.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: remote connection host server file
 author: Announ Marwan
 title: ssh
+previous-page: pages/cmd/interm//shasum.html
+next-page: pages/cmd/interm//strings.html
 ---
 
 The <code>ssh</code> command is used to operate with a remote machine using
diff --git a/site/pages/cmd/interm/strings.html b/site/pages/cmd/interm/strings.html
index b5de7dc..e4521b3 100644
--- a/site/pages/cmd/interm/strings.html
+++ b/site/pages/cmd/interm/strings.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: strings read binaries file
 author: Marco Farace
 title: strings
+previous-page: pages/cmd/interm//ssh.html
+next-page: pages/cmd/interm//sync.html
 ---
 
 The strings command returns each string of printable characters (ASCII)
diff --git a/site/pages/cmd/interm/sync.html b/site/pages/cmd/interm/sync.html
index dbce9c2..305b9dd 100644
--- a/site/pages/cmd/interm/sync.html
+++ b/site/pages/cmd/interm/sync.html
@@ -5,8 +5,8 @@ category-title: Intermediate commands
 tags: sync disk write completion
 author: Gianmarco De Vita
 title: sync
-previous-page: pages/cmd/interm/
-next-page: pages/cmd/interm/
+previous-page: pages/cmd/interm/strings.html
+next-page: pages/cmd/interm/tar.html
 ---
 
 The <code>sync</code> utility force the completion of pending disk writes.</p>
diff --git a/site/pages/cmd/interm/tar.html b/site/pages/cmd/interm/tar.html
index 827bdbe..2698ce2 100644
--- a/site/pages/cmd/interm/tar.html
+++ b/site/pages/cmd/interm/tar.html
@@ -5,6 +5,8 @@ category-page: interm
 tags: tar shell command compress archive
 author: Nicola Brunner
 title: tar
+previous-page: pages/cmd/interm/sync.html
+next-page: pages/cmd/interm/tee.html
 ---
 
 The <code>tar</code> command is used to create and manipulate streaming archive files, in
diff --git a/site/pages/cmd/interm/tee.html b/site/pages/cmd/interm/tee.html
index 1f6a388..350d0ca 100644
--- a/site/pages/cmd/interm/tee.html
+++ b/site/pages/cmd/interm/tee.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: tee output save
 author: Nicola Brunner
 title: tee
+previous-page: pages/cmd/interm/tar.html
+next-page: pages/cmd/interm/watch.html
 ---
 
 The <code>tee</code> command is used to split the output of a program, doing
diff --git a/site/pages/cmd/interm/watch.html b/site/pages/cmd/interm/watch.html
index d1da076..5142d4d 100644
--- a/site/pages/cmd/interm/watch.html
+++ b/site/pages/cmd/interm/watch.html
@@ -5,6 +5,8 @@ category-title: Intermediate commands
 tags: watch repeat track analyse seconds
 author: Claudio Maggioni
 title: watch
+previous-page: pages/cmd/interm/tee.html
+next-page: pages/cmd/interm/who.html
 ---
 The <code>watch</code> command is a system utility able to execute a command
 every <i>n</i> seconds by clearing the screen and displaying the
diff --git a/site/pages/cmd/interm/who.html b/site/pages/cmd/interm/who.html
index 660c195..1e0da95 100644
--- a/site/pages/cmd/interm/who.html
+++ b/site/pages/cmd/interm/who.html
@@ -4,6 +4,7 @@ category-page: intermediate
 category-title: Intermediate commands
 author: Marco Farace
 title: who
+previous-page: pages/cmd/interm/watch.html
 ---
 The <code>who</code> command displays a list of all logged in users/display info
 about current user
diff --git a/site/pages/fs/absolute.html b/site/pages/fs/absolute.html
index c8d9c80..84b17e2 100644
--- a/site/pages/fs/absolute.html
+++ b/site/pages/fs/absolute.html
@@ -5,6 +5,7 @@ category-title: FileSystem
 tags: absolute relative path
 author: Announ Marwan
 title: Absolute paths
+next-page: pages/fs/cd.html
 ---
 
 A path is a location to a folder or file in a file system of a Operating System,
diff --git a/site/pages/fs/cd.html b/site/pages/fs/cd.html
index 9cd44ff..aa190d0 100644
--- a/site/pages/fs/cd.html
+++ b/site/pages/fs/cd.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: change directory
 author: Alessandro Marinelli
 title: cd
+previous-page: pages/fs/absolute.html
+next-page: pages/fs/du.html
 ---
 
 <!-- Co-authored with Mirko Ponzio -->
diff --git a/site/pages/fs/du.html b/site/pages/fs/du.html
index 4a7f5f0..9dc7f9a 100644
--- a/site/pages/fs/du.html
+++ b/site/pages/fs/du.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: disk usage file size
 author: Joey Bevilacqua
 title: du
+previous-page: pages/fs/cd.html
+next-page: pages/fs/ln.html
 ---
 
 The <code>du</code> command is used to display files and directories sizes.<br>
diff --git a/site/pages/fs/ln.html b/site/pages/fs/ln.html
index 8e32998..7d19dc8 100644
--- a/site/pages/fs/ln.html
+++ b/site/pages/fs/ln.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: link symbolic hard file shortcut
 author: Riccardo Antonio Vivanco
 title: ln
+previous-page: pages/fs/du.html
+next-page: pages/fs/ls.html
 ---
 
 The <code>ln</code> command is used to create a link of a file or directory.
diff --git a/site/pages/fs/ls.html b/site/pages/fs/ls.html
index 720ea05..30c975d 100644
--- a/site/pages/fs/ls.html
+++ b/site/pages/fs/ls.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: list file
 author: Mirko Ponzio
 title: ls
+previous-page: pages/fs/ln.html
+next-page: pages/fs/mkdir.html
 ---
 The command <code>ls</code> stands for "LiSt"<br>
 
diff --git a/site/pages/fs/mkdir.html b/site/pages/fs/mkdir.html
index 533674d..0ec5f58 100644
--- a/site/pages/fs/mkdir.html
+++ b/site/pages/fs/mkdir.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: working directory current position where
 author: Mirko Ponzio
 title: mkdir
+previous-page: pages/fs/ls.html
+next-page: pages/fs/mv.html
 ---
 
 <!-- Co-authored with Alessandro Marinelli -->
diff --git a/site/pages/fs/mv.html b/site/pages/fs/mv.html
index 37b22db..443eb08 100644
--- a/site/pages/fs/mv.html
+++ b/site/pages/fs/mv.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: directory list move rename
 author: Mattia Hijman
 title: mv
+previous-page: pages/fs/mkdir.html
+next-page: pages/fs/pwd.html
 ---
 
 <!-- Co-authored with Joy Albertini -->
diff --git a/site/pages/fs/pwd.html b/site/pages/fs/pwd.html
index 2d507ec..31f4820 100644
--- a/site/pages/fs/pwd.html
+++ b/site/pages/fs/pwd.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: working directory current position where
 author: Mirko Ponzio
 title: pwd
+previous-page: pages/fs/mv.html
+next-page: pages/fs/relative.html
 ---
 
 <!-- Co-authored with Joy Albertini -->
diff --git a/site/pages/fs/relative.html b/site/pages/fs/relative.html
index 51acd80..4a18708 100644
--- a/site/pages/fs/relative.html
+++ b/site/pages/fs/relative.html
@@ -5,6 +5,8 @@ category-title: FileSystem
 tags: absolute relative path
 author: Announ Marwan
 title: Relative paths
+previous-page: pages/fs/pwd.html
+next-page: pages/fs/rm.html
 ---
 
 Relative path is defined as path related to the present working directory(pwd).<br>
diff --git a/site/pages/fs/rm.html b/site/pages/fs/rm.html
index acea064..7e54945 100644
--- a/site/pages/fs/rm.html
+++ b/site/pages/fs/rm.html
@@ -5,6 +5,7 @@ category-title: FileSystem
 tags: directory list remove delete erase
 author: Mattia Hijman
 title: rm
+previous-page: pages/fs/relative.html
 ---
 
 The <code>rm</code> command is used to delete and unlink directories and files.<br>
diff --git a/site/pages/scripts/base-commands.html b/site/pages/scripts/0-base-commands.html
similarity index 96%
rename from site/pages/scripts/base-commands.html
rename to site/pages/scripts/0-base-commands.html
index 843335e..6f91bb0 100644
--- a/site/pages/scripts/base-commands.html
+++ b/site/pages/scripts/0-base-commands.html
@@ -5,6 +5,7 @@ category-title: Scripting
 tags: command base echo cat grep
 author: Dario Rasic
 title: Script  Base Commands
+next-page: pages/scripts/1-variables.html
 ---
 <!-- Echo command text -->
 <h3>Echo</h3>
diff --git a/site/pages/scripts/variables.html b/site/pages/scripts/1-variables.html
similarity index 95%
rename from site/pages/scripts/variables.html
rename to site/pages/scripts/1-variables.html
index 7acf9d6..196e49c 100644
--- a/site/pages/scripts/variables.html
+++ b/site/pages/scripts/1-variables.html
@@ -5,6 +5,8 @@ category-title: Scripting
 tags: variables defining deleting naming
 author: Dario Rasic
 title: Script Variables
+previous-page: pages/scripts/0-base-commands.html
+next-page: pages/scripts/2-special-variables.html
 ---
 <!-- Intro -->
 A variable is simply a string to which we assign a certain type of data,
diff --git a/site/pages/scripts/special-variables.html b/site/pages/scripts/2-special-variables.html
similarity index 90%
rename from site/pages/scripts/special-variables.html
rename to site/pages/scripts/2-special-variables.html
index 354b433..8bb7187 100644
--- a/site/pages/scripts/special-variables.html
+++ b/site/pages/scripts/2-special-variables.html
@@ -5,6 +5,8 @@ category-title: Scripting
 tags: variables special $ !
 author: Dario Rasic
 title: Script Special Variables
+previous-page: pages/scripts/1-variables.html
+next-page: pages/scripts/3-parameter_expansion.html
 ---
 <!-- Intro -->
 There are certain strings that we can not use in the variable-naming process.<br>
diff --git a/site/pages/scripts/parameter_expansion.html b/site/pages/scripts/3-parameter_expansion.html
similarity index 97%
rename from site/pages/scripts/parameter_expansion.html
rename to site/pages/scripts/3-parameter_expansion.html
index e281f33..2dd61e4 100644
--- a/site/pages/scripts/parameter_expansion.html
+++ b/site/pages/scripts/3-parameter_expansion.html
@@ -5,8 +5,8 @@ category-title: Scripting
 tags: parameter expansion brace variable check condition empty exists
 author: Marco Tereh
 title: Parameter expansion
-previous-page: pages/scripts/special_variables.html
-next-page: pages/scripts/arrays.html
+previous-page: pages/scripts/2-special-variables.html
+next-page: pages/scripts/4-arrays.html
 ---
 
 There are some special operations that can be performed on
diff --git a/site/pages/scripts/arrays.html b/site/pages/scripts/4-arrays.html
similarity index 97%
rename from site/pages/scripts/arrays.html
rename to site/pages/scripts/4-arrays.html
index c1f38e3..78b694b 100644
--- a/site/pages/scripts/arrays.html
+++ b/site/pages/scripts/4-arrays.html
@@ -5,8 +5,8 @@ category-title: Scripting
 tags: array variable many index selector
 author: Marco Tereh
 title: Arrays
-previous-page: pages/scripts/parameter-expansion.html
-next-page: while-loop.html
+previous-page: pages/scripts/3-parameter_expansion.html
+next-page: pages/scripts/5-for-loop.html
 ---
 
 There is a special kind of <a href="variables.html">variable</a>, called an array.<br>
diff --git a/site/pages/scripts/for-loop.html b/site/pages/scripts/5-for-loop.html
similarity index 95%
rename from site/pages/scripts/for-loop.html
rename to site/pages/scripts/5-for-loop.html
index 86ccc59..20ea638 100644
--- a/site/pages/scripts/for-loop.html
+++ b/site/pages/scripts/5-for-loop.html
@@ -5,6 +5,8 @@ category-title: Scripting
 tags: loop for done script scripting
 author: Matteo Omenetti
 title: For Loop
+previous-page: pages/scripts/4-arrays.html
+next-page: pages/scripts/6-while-loop.html
 ---
 
 <!-- Introduction -->
diff --git a/site/pages/scripts/while-loop.html b/site/pages/scripts/6-while-loop.html
similarity index 97%
rename from site/pages/scripts/while-loop.html
rename to site/pages/scripts/6-while-loop.html
index 083a759..c0f3f47 100644
--- a/site/pages/scripts/while-loop.html
+++ b/site/pages/scripts/6-while-loop.html
@@ -5,6 +5,8 @@ category-title: Scripting
 tags: loop while do script scripting read
 author: Matteo Omenetti
 title: While Loop
+previous-page: pages/scripts/5-for-loop.html
+next-page: pages/scripts/7-if.html
 ---
 
 <!-- Introduction -->
diff --git a/site/pages/scripts/if.html b/site/pages/scripts/7-if.html
similarity index 96%
rename from site/pages/scripts/if.html
rename to site/pages/scripts/7-if.html
index 67b1a77..2639c50 100644
--- a/site/pages/scripts/if.html
+++ b/site/pages/scripts/7-if.html
@@ -4,7 +4,9 @@ category-page: scripts
 category-title: Scripting
 tags: if else script scripting read
 author: Matteo Omenetti
-title: If Statement
+title: If statement
+previous-page: pages/scripts/6-while-loop.html
+next-page: pages/scripts/8-redirection.html
 ---
 
 <!-- Introduction -->
diff --git a/site/pages/scripts/redirection.html b/site/pages/scripts/8-redirection.html
similarity index 97%
rename from site/pages/scripts/redirection.html
rename to site/pages/scripts/8-redirection.html
index b090206..ef4d7c8 100644
--- a/site/pages/scripts/redirection.html
+++ b/site/pages/scripts/8-redirection.html
@@ -5,6 +5,7 @@ category-title: Scripting
 tags: redirect output input
 author: Dario Rasic
 title: Redirection
+previous-page: pages/scripts/7-if.html
 ---
 <h3>output as input</h3>
 <br>