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Q. What is Kernel on Ubuntu / Unix Operating system like Linux?
A. Kernel is the heart of operating system. It interacts with shell and executes the machine level language.

Q. How can I save my input and output commands and see them when required in Linux?
A. At the beginning of the session if I will use SCRIPT command then the details of the input and output commands will be saved in a file called typescript and we can view it any time using “cat typescript” command.
This is very useful to track what user is doing what. HISTORY command will not work because it shows data only for the current session.
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Q. How can I check which processes are running in my Linux machine?
A. To check process which are running in machine, use two commands.
(a) TOP and (b) PS

Q. You used TOP command and without aborting the TOP process I need to kill one process. Is it possible to kill ??
A. Yes TOP command it self has a command prompt. Type K then it will ask you for the PID of the process to kill. Hit the PID and enter, it will kill the process.

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Q. What is the difference between creating a file in cat and in touch command on Linux?
A. $cat command creates a file and we can save some data inside the file but touch command by default will create a blank file.


Q. I want to create a directory a1 and inside that a2 and inside that a3. Is it possible? If yes how ?
A. Yes creating multiple directories is possible. In this scenario the below command works.
$mkdir –p  a1/a2/a3
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Q. How can I check in which directory I am in ?
A. Use PWD command to check which directory you are in.

Q. How can I list the directories and the files ?
A. Using ls command.
I can view the directories and files of the system.

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