LAB 3

 

Operating System : LAB 3

Part 1

For this part we will add the export PSI="\h\u\w\$" in bashrc so the changes made will be permanent. In previous lab, we use export PS1 in terminal, it will only changes temporarily in terminal 

 

In this lab, we use .bashrc file to save the PSI permanently and we can also remove it if we want.

A command we can use : use sudo nano .bashrc to open .bashrc file

Scroll to the last coding and add export PS1="/H/U/W/$" and save it

After saved .bashrc file in the terminal then type bash in terminal and press enter. Now we can see the PS1 is changed. To undo, go to .the bashrc file again and remove export PS1 and save it. Then PS1 will change back to default format.

Part 2

Before getting into this part,make sure to create some files.

"file with blanks.txt"

"special>.txt"

"-startswithdash.txt"

After that  run ls -la file with blanks.txt and notice the errors. Then, run again the command but enclose the file name for example ; ls -la "file with blanks.txt" and it will work properly now .

Part 3

Run the following command : ping -c 1 packt.com

It should be like this 

However my Kali Linux cannot connect with internet network. Therefore, it become like this;

If this part succed. We need to run command "echo $?" and get 0 for success.

Then run the followin command : ping -c 1 phooey and run echo $? again. It should return non zero value indicate failure.

Part 4

Type ifconfig>file1.txt in terminal but we cannot see anything because the output went to file.

Type "cat file1.txt" and we can see the output.

If we type "sort<file1.txt" , it will work to read from file.

There are another way we can do both in one step "sort<file1.txt>output-file.txt"

Part 5 

In this part, we can learn how to send output from one terminal to another terminal. First run the "tty" command and the output will come out like this : /dev/pts/2

The other terminal type route command and enter. After output appeared in terminal, run route command again but using this command:

route>/dev/pts/2

The output will go to other terminal as we can see in figure below.

Part 6

Use this command to install the screen directory : sudo apt-get install screen

 

Type screen -list , it will shows all the windows.

Part 7

In terminal run the screen -L command and it will clear out the screen. If we press Ctrl+A and then press C, it will create another window