ifConfig page added and corrected various imperfections in while for and if pages

git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@207 a672b425-5310-4d7a-af5c-997e18724b81

site/pages/cmd/interm/ifConfig.html

@@ -0,0 +1,61 @@
+---
+layout: page
+category-page: intermediate
+category-title: Intermediate commands
+tags: command IfConfig
+author: Matteo Omenetti
+title: IfConfig
+---
+<!-- Introduction -->
+<i> IfConfig </i> stands for "<b>I</b>nterface <b>C</b>onfiguration". It is used
+to configure, control, and query network interface parameters of your system. <br>
+If you try running this command with no arguments, it will simply display information
+about all network interfaces currently active. <br>
+{% highlight bash %}
+  ifConfig
+{% endhighlight %}
+The output sill resembles something like this, of course it changes from machine
+to machine:
+
+<pre>
+en5: flags=8863 UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST mtu 1500
+	ether ac:de:48:00:11:22
+	inet6 fe80::aede:48ff:fe00:1122%en5 prefixlen 64 scopeid 0x8
+	nd6 options=201 PERFORMNUD,DAD
+	media: autoselect (100baseTX full-duplex)
+	status: active
+
+ap1: flags=8802 BROADCAST,SIMPLEX,MULTICAST mtu 1500
+	ether f2:18:98:41:74:42
+	media: autoselect
+	status: inactive
+
+  ...
+</pre>
+<!-- End of Introduction -->
+
+If you want to view the configuration of all network interfaces, not just the ones currently active, you can use
+flag <code>a</code>.
+{% highlight bash %}
+IiConfig -a
+{% endhighlight %}
+
+If you want to view the configuration of a specific interface, you can specify the name of the interface
+you want to view after the command <i>IfConfig</i>:
+{% highlight bash %}
+  ifConfig ap1
+{% endhighlight %}
+This command will show only the configuration of ap1.
+
+To enable an interface, you can use the command ifConfig with the name of the interface
+you want to enable, followed by the key word <code>up</code>.
+However, enabling or disabling a device, is a privilege reserved for the super user, therefore you also
+have to use the command <code>sudo</code>.
+{% highlight bash %}
+   sudo ifConfig ap1 up
+{% endhighlight %}
+
+To disable an interface, you can follow the same procedure, this time using the key word <code>down</code>.
+{% highlight bash %}
+   sudo ifConfig ap1 down
+{% endhighlight %}

site/pages/scripts/for-loop.html

@@ -9,16 +9,16 @@ title: For Loop
 
 <!-- Introduction -->
 The second type of loops are for loops.
-They follow this sintax:
+They follow this syntax:
 {% highlight bash %}
   for [variable] in [list] do
     [code]
   done
 {% endhighlight %}
 
-Their purpose is to <i>iterate</i> over a list. Also while loops could do this, you might argue... <br>
-Of course they could, but for loops are specifically meant to do this. Therefore, for instance,
-you don't have to decleare your counter variable outside the loop. Most importantly,
+Their purpose is to <i>iterate</i> over a list. Also, while loops could do this, you might argue... <br>
+Of course, they could, but for loops are specifically meant to do this. Therefore, for instance,
+you don't have to declare your counter variable outside the loop. Most importantly,
 this variable can be accessed from inside the loop. <br>
 
 For loops take this form:
@@ -53,12 +53,12 @@ The output of this piece of code is:
 </pre>
 <!-- End of First Example -->
 
-<!-- Explenation of Numerical Range -->
+<!-- Explanation of Numerical Range -->
 There are also other ways to specify the <i> numerical range </i>. For instance, if your numerical range
 is too big, you can simply write: <code> {1..100} </code>. This piece of code means every natural number
 between 1 and 100 (both included). <br>
 Ranges can also count backward like this: <code>{10..1}</code>.
-You can even icrement the numerical value by step of two: <code> {0..10..2} </code>.
+You can even increment the numerical value by step of two: <code> {0..10..2} </code>.
 This piece of code means every natural number between 0 and 10 with a step of two,
 0 2 4 6... 10.
-<!-- End of Explenation of Numerical Range -->
+<!-- End of Explanation of Numerical Range -->

site/pages/scripts/if.html

@@ -21,7 +21,7 @@ if [condition]; then
 fi
 {% endhighlight %}
 
-Anything between <code>then</code> and <code>fi</code> will be executed only if the condtion
+Anything between <code>then</code> and <code>fi</code> will be executed only if the condition
 evaluates to true. <br>
 Here is a simple example:
 
@@ -33,9 +33,9 @@ if [$i -ge 200]; then
  fi
 {% endhighlight %}
 
-In this first example we evaluate a varibale <code>i</code> to 105.
+In this first example we evaluate a variable <code>i</code> to 105.
 The <i> if statement </i> will print "You chose a big number"
-only if the number contained in our varibale <code>i</code> is <b>G</b>reater or
+only if the number contained in our variable <code>i</code> is <b>G</b>reater or
 <b>E</b>qual to 200. <br>
 This is our case, therefore the output of this piece of code will be:
 <pre>
@@ -47,7 +47,7 @@ This is our case, therefore the output of this piece of code will be:
 <!-- If Else -->
 <h3> If Else </h3>
 
-Sometimes we want to perform a certain set of actions, if our condtion evaluates to
+Sometimes we want to perform a certain set of actions, if our condition evaluates to
 true and another set of actions if our condition evaluates to false. We can do this with
 the <i> if else </i> statement.
 <i> if else </i> sattements take this form:
@@ -76,12 +76,12 @@ else
 fi
 {% endhighlight %}
 
-In this example, that is just an extention of the previuous example, we
-evealuate a variable <code>i</code> to 50. If <code>i</code> is gretaer or equal to
+In this example, that is just an extension of the previous example, we
+evaluate a variable <code>i</code> to 50. If <code>i</code> is greater or equal to
 200, you print out "You chose a big number", otherwise,
-(if <code>i</code> is not gretaer or equal to 200), just like in this case, you print out
+(if <code>i</code> is not greater or equal to 200), just like in this case, you print out
 "You chose a small number".
-Therefore the output of this piece of code is:
+Therefore, the output of this piece of code is:
 
 <pre>
   You chose a small number.
@@ -91,8 +91,8 @@ Therefore the output of this piece of code is:
 
 <!-- If Elif Else -->
 <h3> If Elif Else </h3>
-Sometimes, in programming, it is necessary to have a series of condtions that lead to different paths.
-We can accomodate this need with the <i>if else elif</i> mechanism.
+Sometimes, in programming, it is necessary to have a series of conditions that lead to different paths.
+We can accommodate this need with the <i>if else elif</i> mechanism.
 The <i>if else elif</i> mechanism takes this form:
 
 {% highlight bash %}
@@ -128,11 +128,11 @@ else
 fi
 {% endhighlight %}
 
-In this example, that is just an extention of the previuous example, we evealuate a
-variable <code>i</code> to 150. If <code>i</code> is gretaer or equal to 200,
+In this example, that is just an extension of the previous example, we evaluate a
+variable <code>i</code> to 150. If <code>i</code> is greater or equal to 200,
 you print out "You chose a big number", if <code>i</code> is equal to 150 you print out
 "You chose 150" otherwise you print out "You chose a small number".
-Therefore the output of this piece of code is:
+Therefore, the output of this piece of code is:
 
 <pre>
   You chose 150.

site/pages/scripts/while-loop.html

@@ -41,10 +41,10 @@ done
 {% endhighlight %}
 
 In this first example, you simply create a variable called i and evaluate it to 0.
-Then you acces the while loop: the condition <code> [$i -lt 4] </code> means that this while
-loop will run until the <code> i </code> varibale is less than 4.
+Then you access the while loop: the condition <code> [$i -lt 4] </code> means that this while
+loop will run until the <code> i </code> variable is less than 4.
 Every cycle of this loop, you print out the value of variable i with <code> echo $i </code>
-and finally you increase its value by 1 with <code> i=$((i + 1)) </code>.
+and finally, you increase its value by 1 with <code> i=$((i + 1)) </code>.
 Therefore in 4 cycles the value of i will be 4. This will make the condition of the while loop false.
 The output of this piece of code is:
 <pre>
@@ -58,7 +58,7 @@ The output of this piece of code is:
 
 
 <!-- Infinite Loop First Example -->
-Sometimes it is required to decleare infinite loops for various programming purposes. <br>
+Sometimes it is required to declare infinite loops for various programming purposes. <br>
 Here is an example:
 {% highlight bash %}
 i=1;
@@ -82,7 +82,7 @@ No termination condition is set for this loop in this example. This type of loop
 is called infinite loop.<br>
 The <code> exit </code> statement is used to quit the loop. This loop will
 iterate for 9 times, then
-as soon as <code> i </code> becomes equal to 0, the condtition of the last if
+as soon as <code> i </code> becomes equal to 0, the condition of the last if
 statement will evaluate to true and the loop will be terminated. <br>
 
 The output of this piece of code is:
@@ -115,7 +115,7 @@ done
 
 <!-- Read  -->
 In scripting, while loops are often used to process files line by line. <br>
-Here is an examaple:
+Here is an example:
 {% highlight bash %}
 while read -r first_name last_name phone;
 do
@@ -125,12 +125,12 @@ done &lt; "$file"
 
 The <code> read </code> command is used to read a file line by line.
 The flag <code> -r </code> is used to tell the
-command read to intepret backslashes (/) literally, instead as escape characters.
+command read to interpret backslashes (/) literally, instead as escape characters.
 This command, expect for some few
 rare cases, should always be used with this flag.
 In this example, <code> &lt; "$file" </code> redirects the loop's input from a file
 whose name is stored in a variable.
-This file has 3 colums, <code> first_name last_name phone </code>, separated by
+This file has 3 columns, <code> first_name last_name phone </code>, separated by
 blank space (or a tab).
 This piece of code only prints out the second column.
 <!-- End of Read -->