LAB 3
DKT 221/3
OPERATING SYSTEM PRINCIPLE
LAB
MODULE 3
PART 1
1. Use this command to open .bashrc file
- sudo nano .bashrc
2. Next we need to add the export PS1 command in the .bashrc. Go to the last line of coding and add
- export PS1= "\h \u \w \$"
3. In order to load the saved .bashrc file . We need to use this command then press ENTER
- bash
- . .bashrc
4. To undo the change we need to go back to the .bashrc file again
- sudo nano .bashrc
5. Next . remove this command and save the changes
- export PS1= "\h \u \w \$"
6. After that , type the command again and press ENTER . Now we see that the PS1 is changed back to normal
- . .bashrc
PART 2
1. Create 3 dummy files , run and see the errors
- ls -la File with no name.txt
2. Run the command again but enclose the filename in quotation . It wil work properly now
- ls -la "File with no name.txt"
3. Enter this command and press TAB . This will help fill in the blanks for you
- ls -la File\ with\ no\ name\.txt
4. Run and observe the error
- ls -la special.txt
5. Enclose the command in quotatios as we did before
- ls -la "special.txt"
6. Type this and then try putting quotation on it . You will see that it doesn't work
- ls -la -startswithdash.txt
7. To fix this you need to put the ./ operator at the command
- ls -la ./-startswithdash.txt
PART 3
1. Run the command
- ping -c 1 packt.com
2. Next , run the command . And you should get a 0 if it works properly
- echo?
3. Then run the command
- ping -c 1 phooney
4. Run this command and it should return a non-zero value to show that it was a failure
- echo $?
PART 4
1. Enter this command . There wont ba any result because the output went into the file
- ifconfig>file1.txt
2. Run this in order to see the output
- cat file1.txt
3. Theres another way to read the file and that is using the command
- sort<file1.txt
4. We can eve do both in just one command
- sort<file1.txt>output-file.txt
5. We can also send the output to another command using the pipe operator . This would display only the lines from route that contain the phrase wlan0
- route | grep wlan0
PART 5
1. In one terminal , we run
- tty
2. In the other terminal , run this command
- route
3. Then run this . The output should show in the other terminal
- route>/dev/pts/0
PART 6
1. Install
- sudo apt-get install screen
- screen -list
PART 7
1. In the terimal , run the command
- screen -L
2. Now press CTRL+A and C .I It will create another window
3. Type CTRL+A+0
4. Type CTRL+A+3 . It will go to copy mode where you can copy any command that you wrote
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