Question

Linux

9. Use the command: tr r R < /etc/issue > newissue. What happens?

10. Use the command: sort < newissue > newissue. What happens?

11. Use the command: ls -l /etc | less. What is the purpose of the vertical bar? What does it do in this command?

12. Use the command: mount | grep ext4. What happens?

Answer 1

9. It will replace all the 'r' with 'R' in text stored in /etc/issue and it will store the changed text in newissue or whatever file will be mentioned.

10. It is used to sort the data in a file. sort <file1 > file2 , it will sort all the words lexicographically and store it in file2.

11. " ls -l /etc " will print all the directories and folders in the /etc folder where -l means list representation is needed. So if "| less " is added to the command, it means we do not want it to print on the screen, list will be shown in new page which can also be scrolled and q can be pressed to return back to the terminal.

12. " mount " command lists all the directories which are mounted in the system, by adding " | grep ext4 " system will show if ext4 has been mounted or not.