View source for Introduction to Linux in HPC/Linux Directory Structure

[[Category:Tutorials]]
{{DISPLAYTITLE:<span style="position:absolute; top:-9999px;">Introduction to Linux in HPC/</span>Directory structure}}

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=== Video === <!--T:5-->

<youtube width="600" height="400" right>7O0Fa0stBsQ</youtube>

=== Quiz === <!--T:5-->  

{{hidden begin 
|title = 1. Which one is the top directory in Linux?
}}
<quiz display=simple>
{
|type="()"}
+  <code>/</code>
|| Explanation: The tree structure for directory is used in Linux system. Therefore the top directory in Linux is /. The /home directory may be an upper level directory for all non-root users. The last option C:\ represents the C drive on Windows.
-  <code>/home</code>
|| 
-  <code>C:\</code>
|| 
</quiz>
{{hidden end}}


{{hidden begin 
|title = 2. The command <code>cd</code> without arguments : if you start in <code>var/log/</code> and run <code>cd</code> with no arguments, what do you expect will happen?
}}
<quiz display=simple>
{
|type="()"}
- Nothing it stays in <code>/var/log/</code>
||
+ It goes to your home directory
|| Explanation: It goes to your home directory. <code>cd</code> without arguments is a shortcut to take you home. As long as your home directory exists, you can always go home
- It goes to the filesystem root
||  
- The shell stops having a working directory
|| 
- It’s an error
||
- The shell prompt turns into a shark and eats you
||
</quiz>
{{hidden end}}


{{Warning|mode=warn|text= '''no undo and make sure what you want to do (page 48)'''}}


=== Exercises in Terminal (slide 49)=== <!--T:5--> 

 1. Go to a specific subfolder of a folder (example: <code>cd Documents/courses/</code> ) and get back to the home directory using <code>cd</code> command. List 3 different ways to do it using one command. check after every action your path with <code>pwd</code> command.
   {| role="presentation" class="wikitable mw-collapsible mw-collapsed"
    | <strong>Answer:</strong>
    |-
    | 
       <code>cd</code>
       <code>cd ~</code>
       <code>cd $HOME</code>
        the last option $HOME is an enviornment variable. You will learn about enviornment variables later.
    |}
       
 2. Go to the directory <code>/tmp</code> and jump between <code>/tmp</code> and your home directory back and forth. check after every action your path with <code>pwd</code> command.
   {| role="presentation" class="wikitable mw-collapsible mw-collapsed"
    | <strong>Answer:</strong>
    |-
    | 
        <code>cd /tmp</code>
        <code>cd -</code>
        <code>cd -</code> with <code>cd -</code> you change back to the previous working directory, pass the dash <code>-</code> character as an argument to the <code>cd</code> command.
    |}

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