= Basic Linux Commands Exercise =

Let's put some of our new knowledge into practice by creating a new directory to house some files we'll be using throughout the day. 

== Goal: Create a subdirectory in your home directory ==

While logged into Cypress, make a new subdirectory in your home directory:
* Navigate to your home directory by using the '''cd ~''' command. 
* Check that you are in your home directory by using the '''pwd''' command.
{{{
[tuhpc002@cypress1 ~]$ cd ~
[tuhpc002@cypress1 ~]$ pwd
/home/workshop/tuhpc002
[tuhpc002@cypress1 ~]$ 
}}}

* Make a new subdirectory called "examples" using the '''mkdir''' command. 
* Check that the directory was created by using the '''ls''' command. 
{{{
[tuhpc002@cypress1 ~]$ mkdir examples
[tuhpc002@cypress1 ~]$ ls
examples
[tuhpc002@cypress1 ~]$ 
}}}

Next, let's move some files into our new directory
* Move into the examples subdirectory using the '''cd command''' and the relative path directory examples
{{{
[tuhpc002@cypress1 ~]$ cd examples/
[tuhpc002@cypress1 examples]$ 
}}}

* Now, check the contents of the directory "/lustre/project/workshop/textfiles" using the '''ls''' command and the absolute path directory (Hint, you can use the tab key to autocomplete partially typed commands)
{{{
[tuhpc002@cypress1 textfiles]$ ls /lustre/project/workshop/textfiles/
alphabet.txt  numbers.txt
[tuhpc002@cypress1 textfiles]$ 
}}}

Now, examine the contents of those files

* Use the '''cat''' command to examine the content of the numbers.txt file
{{{
[tuhpc002@cypress1 examples]$ cat numbers.txt 
01
02
03
04
05
06
07
08
09
10
[tuhpc002@cypress1 examples]$ 
}}}

* Use the '''tail''' command to list the last 4 lines of the numbers.txt file
{{{
[tuhpc002@cypress1 examples]$ tail -4 numbers.txt
07
08
09
10
[tuhpc002@cypress1 examples]$
}}}

* Invoke the '''head''' command to list the first 5 lines of the alphabet.txt file
{{{
[tuhpc002@cypress1 examples]$ head -5 alphabet.txt
a
b
c
d
e
[tuhpc002@cypress1 examples]$ 
}}}

Lastly, let's practice copying, moving, and removing files
* Copy the contents of the textfiles directory to your examples directory using the '''cp''' command
* Use the '''ls''' command to ensure that you've transferred the correct files to the correct directory  
{{{
[tuhpc002@cypress1 examples]$ cp /lustre/project/workshop/textfiles/alphabet.txt alphabet.txt
[tuhpc002@cypress1 examples]$ cp /lustre/project/workshop/textfiles/numbers.txt numbers.txt
[tuhpc002@cypress1 examples]$ ls
alphabet.txt  numbers.txt
[tuhpc002@cypress1 examples]$ 
}}}

* Create a backup of the "numbers.txt" file named "numbers_backup.txt" using the '''cp''' command.
{{{
[tuhpc002@cypress1 examples]$ cp numbers.txt numbers_backup.txt
[tuhpc002@cypress1 examples]$ ls
alphabet.txt  numbers_backup.txt  numbers.txt
[tuhpc002@cypress1 examples]$ 
}}}

* Remove the original "numbers.txt" file using the '''rm''' command
{{{
[tuhpc002@cypress1 examples]$ ls 
alphabet.txt  numbers_backup.txt  numbers.txt
[tuhpc002@cypress1 examples]$ rm numbers.txt
[tuhpc002@cypress1 examples]$ ls
alphabet.txt  numbers_backup.txt
[tuhpc002@cypress1 examples]$ 
}}}

* rename the backup file "numbers.txt" using the '''mv''' command
{{{
[tuhpc002@cypress1 examples]$ ls
alphabet.txt  numbers_backup.txt
[tuhpc002@cypress1 examples]$ mv numbers_backup.txt numbers.txt
[tuhpc002@cypress1 examples]$ ls
alphabet.txt  numbers.txt
[tuhpc002@cypress1 examples]$ 
}}}

== Challenge ==

* Create two new subdirectories in your home directory called "letters" and "digits". 
* Move the alphabet.txt file to the letters directory and the numbers.txt file to the digits directory. 
* Lastly remove the examples directory from your home directory.

[[cypress/BasicLinuxComands|return to basic linux commands page]]