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git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@135 a672b425-5310-4d7a-af5c-997e18724b81
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annoum 2018-11-12 12:04:46 +00:00
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site/pages/fs/ab_re_quiz.html
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@ -16,3 +16,17 @@ title: fs
</p>
<!-- quiz about absolute vs relative, where the user have to choose one or another(javascript) -->
<h2> I'm sure that if you read this for two times or more you will able to pass the quiz </h2>
Yeah, right, there is a quiz.
<br> The best way to learn something it's not the theory, in fact you have to do some practice, if you click
<br> the button "QUIZ", you can try to do a quiz to check what you read.
<br><br><br> Don't worry it's for you, good luck
<br><br><br> * for css, please try to do a button or layout to links the quiz*
<!-- quiz di javascript pronto che linkero -->

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site/pages/fs/absolute.html
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@ -4,34 +4,71 @@ category-page: fs
category-title: FileSystem
tags: absolute relative path
author: Marwan Announ
title: Absolute paths
title: paths
---
<h1>Absolute Path</h1>
<h2>First, what is a path?</h2>
<p>
A path is a location to a folder or file in a file system of a Operating System,
then is a combination of characters and "/".<br>
A path is a location to a folder or file in a file system of a Operating System, then is a combination of characters
and "/"
</p>
An absolute path is defined as specifying the location of a file or directory
from the root directory (/).In other words we can say absolute path is a complete
path from start of actual filesystem from / directory.<br><br>
<h3>Now, what is an Absolute path?</h3>
<h3>To write an absolute path-name:</h3>
Start at the root directory ( / ) and work down.<br>
Write a slash ( / ) after every directory name (last one is optional).<br>
<p>
An absolute path is defined as specifying the location of a file or directory from the root directory(/).
In other words we can say absolute path is a complete path from start of actual filesystem from / directory.
</p>
If for example, we the commands "cat group1.txt", it'll work only and only if the "group1.txt"
exist in the current directory.<br>
If doesn't works, it's not a problem, you just have to know where the file is actually stored.<br>
Now, we suppose that you know where your file is saved so you can rewrite the command.
"cat /home/a1/group1.txt".<br>
<h4>To write an absolute path-name:</h4>
As you can see from the last commands, the path started from "/" which is the root directory
for every Unix machines.<br>
<p>
Start at the root directory ( / ) and work down.
<br>Write a slash ( / ) after every directory name (last one is optional)
</p>
Here are some other examples of absolute paths:
<h5>Example:</h5>
<ul>
<li>/home/user/Document/group1.txt</li>
<li>/root/data/dev.zip</li>
<li>/var/log/messages</li>
</ul>
<p> cat group1.txt </p>
if for example, we use the above line, this commands work only and only if the "group1.txt" exist in the current
directory.
<br> If not works, it's not a problem, the file is present somewhere, before restart the new command, you have to
know where
<br> the file is saved.
<br> Now, we supposed that you know where your file is saved you can rewrite the command.
<p> cat /home/a1/group1.txt</p>
Now, we suppose that the file is saved into folder a1 in home,
<br>where: /home is the location respect to root, in fact, you have to descend one level
<br>in the file system like above to access your file.
As you can see from the last commands, all the paths started from /directory whis is a root directory for every Unix
machines.
<p> Other examples, where all are absolute path</p>
/home/user/Document/group1.txt
/root/data/dev.jpg
/var/log/messages
<h6>Example of Absolute path's uses:</h6>
Now, as we learned from the previous pages we can use other commands in addition to "cat", such as:
<br>ls /etc
<br>ls /usr/share/games if you have games obviously :)
<br>cd /usr/share/games
<br>cd ~
<br>cat /etc/passwd
<br>cp /etc/passwd /tmp
<br>cd /tmp
<br>cat passwd
<br><br><br> <h7> Read this if you are not Bill Gates, so read this.. </h7>
<p> So, if you dont't understand anything, like me before this writing, you have to know that Absolute pathnames start with a
<br>slash on the left(simplyfied version..).
<br>For example etc/passwd is a good example of Absolute pathnames.

57
site/pages/fs/relative.html
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@ -4,21 +4,50 @@ category-page: fs
category-title: FileSystem
tags: absolute relative path
author: Marwan Announ
title: Relative paths
title: fs
---
Relative path is defined as path related to the present working directory(pwd).<br>
Suppose I am located in /home/user and I want to change directory to /home/user/Documents.<br>
I can use relative path concept to change directory to Documents.
<h1>Relative Path!</h1>
<pre>
pwd
/home/user
cd Documents
pwd
/home/user/Documents
</pre>
Relative path is defined as path related to the present working directory(pwd).
<br>Suppose I am located in /home/user1 and I want to change directory to /home/user1/Documents.
<br>I can use relative path concept to change directory to Documents.
<br> <br> <br>
<p> pwd/home/user1cd Documents </p>
If you observe, there is a little bit difference between absolute and relative paths:
in relative paths there is no "/" at the very beginning.<br>
Meanwhile in an absolute path you have to write "/", in this case it'd be "/home/user/Documents".
<br> <br> <br> Then you could tell me what is the difference between Absolute and Relative.
<br> If you observe, there is a little bit difference, where in relative there is no "/".
<br> Meanwhyle using absolute path you have to write "/", in this case cd /home/user1/Documents.
<!-- esempi con altri comandi+foto -->
<h2>Example of Relative path's uses:</h2>
Now, as we learned from the previous pages we can use other commands in addition to "cat", such as:
<br><br>pwd
<br> cd .
<br><br>pwd
<br> cd ..
<br><br>pwd
<br> cd ..
<br><br>pwd
<br> cd
<br><br><br> and so on.. I know, it's boring but it is one of the disadvantages of not being present in the
<br>working directory
<br><br> <h3> Why Relative Path!? </h3>
Now, if you read the last page regarding Absolute path you can ask me, good, but how i can know if is an Absolute or Relative?
<br>If the question is this , you can continue the reading, else please try to do the quiz to verify what you have learn
<br>about path, Absolute and Relative.
<br>Ok, you have to know that Pathnames with no leading slash on the left are called RELATIVE pathnames, so, if you look and there
<br>are no slash on the left you know that is a relative.
<br>For example, "/bar" is not a relative because have slash on the left, but you have to know that relative path can have slash before.
<br>If you observe ../bar have slash, but it's not an asbolute(after the previous reading you have to know why it's not an absolute ;) )
<!-- quiz in javascript about relative and what the user know after the reading-->