February 3, 2018

Sreekanth B

Ubuntu Experienced Interview Questions Answers

1) How to uninstall the libraries in Ubuntu?

To uninstall the libraries in Ubuntu, you can use command sudo apt – get remove library_name

2) What is Unity in Ubuntu ? How can you add new entries to the launcher?

In Ubuntu, Unity is the default windows manager.  On left side of the Ubuntu it introduces the launcher and Dash to start programs.

In order to add new entries to the launcher you can create a file name like .desktop and  then drag file on the launcher.

3) How you can run an Ubuntu program in the background simultaneously when you start your Ubuntu Server?

By using nohup.  It will stop the process receiving the NOHUP signal and thus terminating it you log out of the program which was invoked with.  & runs the process in the background.

4) How to enable root loging in Ubuntu?

The command which enables root loging is

#sudo sh-c ‘echo “greater-show-manual-login=true” >>/etc/lightdm/lightdm.conf’

5) How to enable startup sound in Ubuntu?

To enable startup sound in Ubuntu

Click control gear and then click on Startup Applications
In the Startup Application Preferences window, click Add to add an entry
Then fill the information in comment box like Name, Command and Comment
/usr/bin/canberra-gtk-play—id= “desktop-login”—description= “play login sound”

Logout and then login once you are done

6) How you can reset Unity Configuration?

To reset the unity configuration the simplest way to do is to hit open a Terminal or hit Atl-F2  and run the command # unity –reset

7) How to access Terminal?

To access terminal , you have to go under Application Menu -> Accessories -> Terminal .

You can also open it with shortcut key Ctrl+Alt+T.

8) Why Ubuntu is safe and not affected by viruses?

It does not support malicious e-mails and contents, and before any e-mail is opened by users it will go through many security checks
Ubuntu uses Linux , which is a super secure O.S system
Unlike other O.S, countless Linux users can see the code at any time and can fix the problem if there is any
Generally, Malwares and viruses are coded to take advantage of weakness in Windows

9) How you can view the text file in Ubuntu using Terminal?

To view the text file in Ubuntu, go to the specific folder where the text files are located by using the command cd and then type less filename.txt.

10) How to enable curl on Ubuntu LAMP stack?

To enable curl on Ubuntu , first install libcurl, once done use following command sudo/etc/init .d /apache2 restart or sudo service apache2 restart.

11) How you can find a file in Ubuntu using Terminal?

To find a file in Ubuntu you have to use command, find . –name “process.txt” .  It will look for the current directory for a file called process.txt.

12) What is the quicker way to open an Ubuntu terminal in a particular directory?

To open Ubuntu terminal in a particular directory you can use custom keyboard short cut. To do that, in the command field of a new custom keyboard , type genome – terminal – – working – directory = /path/to/dir.

13) What is the meaning of “export” command in Ubuntu?

Export is a command in Bash shell language, when you try to set a variable, it is visible or exported to any subprocess started from that instance of bash.  The variable will not exist in the sub-process without the export command.

14) How you can create a folder in Ubuntu using Terminal?

To create a folder in Ubuntu, you have to use command mkdir.  It will be something like these :  ~$ mkdir Ubuntu_rules.

15) How you create launchers on desktop in Ubuntu?

To create launchers on desktop in Ubuntu you can use

ALT+F2 then type “ gnome-desktop-item-edit –create-new~/desktop “,  it will launch the old GUI dialog and create a launcher on your desktop.

16) How you can get the current color of the current screen on the Ubuntu desktop?

You can open the background image in The Gimp (image editor) and then use the dropper tool to select the color on the specific point. It gives you the RGB value of the color at that point.

17) Explain what is the purpose of using libaio package in Ubuntu?

Libaio is Linux Kernel Asynchronous I/O (A/O).  A/O allows even a single application thread to overlap I/O operations with other processing, by providing an interface for submitting one or more I/O requests in one system call without waiting for completion.  And a separate interface to reap completed I/O operations associated with a given completion group.

18) How can you check the memory status ?

You can use the command

free -m  to display output in MB

free -g  to display output in GB.

19) Explain how to color the Git console in Ubuntu?

To color the Git console in Ubuntu you can use the command git config—global color.ui auto.  In the command, the color.ui variable sets the default value for variable such as color.diff and color.grep.

20) How you can append one file to another in Ubuntu Linux?

To append one file to another in Ubuntu Linux you can use command cat file2 >> file 1.  The operator >> appends the output of the named file or creates the file if it is not created.  While another command cat file 1 file 2 > file 3 appends two or more files to one.

21) What is the use of behaviour tab in Ubuntu?

Through behaviours tab you can make many changes on the appearance of desktop

Auto hide the launcher : You can use this option to reveal the launcher when moving the pointer to the defined hot spot.
Enable workspaces:  By checking this option you can enable workspace
Add show desktop icon to the launcher: This option is used to display the desktop icon on the launcher

22) What is the command to calculate the size of a folder?

To calculate the size of a folder use the command du –sh folder1.

23) What is a folder in Ubuntu ?

There is no concept of Folder in Ubuntu. Everything including your hardware is a FILE.

24) How can you find status of a process using Ubuntu ?

Use the command

ps ux

25) Whether your video card can run Unity how would you know?

When you use command /usr/lib/nux/unity_support_test-p it will give detailed output about Unity’s requirements and  if they are met, then your video card can run unity.

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