Ubuntu and Cent OS.

(i) Red Hat
(ii) Ubuntu
(iii) Cent OS
(iv) Linux Mint

Open source refers to a program or software in which the source code is available to the general public for use and/or modification from its original design, free of charge.

Choose an option logout through the session indicator on the far right side of the top paner.

Open Source refers to a program or software in which the source code is available in the web to the general public free of cost.

(i) An operating system (OS) is a software program that enables the computer hardware to communicate and operate with the computer software.
(ii) It also acts as an interface between the user and the computer hardware and controls the execution of all kinds of programs.

The most popular operating systems are as follows:
(i) Windows 7 is the most popular operating system for desktop and laptop computers.
(ii) Android is the most popular smart phone operating system.
(iii) iOS is the most popular tablet operating system.

Save - This will save the document without asking for a new name or location. It will overwrite the original.
Save As - This will prompt you to save the document using a dialog box. This allows to change the file name or location.

Five fox is a browser. Thunderbird is email client which can be used view emails received.

(i) Different desktop managers lead to a fragmented experience.
(ii) Too many package Managers makes Ubuntu hard to learn and master.
(iii) Lack of software
(iv) Hardware compatibility.

There are two ways in which a new folder is created:
Way I:
(i) Locate and select the folder on the drive where you want to create a new folder. The folder must be selected before continuing. In figure (selecting a folder to create a folder under it) the folder Mathi is selected to create a New Folder under it.
(ii) Click on File menu, select New, then select Folder.

Selecting a folder to create a folder under it.

Creating a Folder using, File Menu
(i) Type in the folder name and press Enter to finalize (you can also click away from the new folder, outside its surrounding rectangle to finalize).

Typing name to the newly created Folder
(ii) In this case, the folder name is given as "Test Folder".
Way II: In order to create a folder in the desktop:
(i) On the Desktop, right click and select New option from the pop-up menu.
(ii) From the sub-menu, select Folder option. (Refer figure 5.23 to know the procedure)

(iii) A Folder appears with the default name "New Folder" and it will be highlighted.

(iv) Type the name you want.
(v) Click anywhere else in the window or else press Enter key.
(vi) The name of the folder changes to what you have typed.

In Ubuntu OS:
(i) Create a file: By right clicking in the desktop' and also files be created by using file menu.
(ii) Delete a file: By using right click choosing move to trash or by using menu.
(iii) Rename a file: By using right click and choosing rename option.
(iv) Save a file: Press ctrl + x or F2 to exit. You will. then be asked if you want to save. (or) Press ctrl+ O or F3 and ctrl + x or F2 for save and exit.
In windows OS:
(i) Create file: Open an application and created by using file menu.
(ii) Delete a file: By right click on a file and choose delete option to delete a file.
(iii) Rename a file: By right click on a file and choose rename option to rename a file.
(iv) Save file: Press ctrl+S or file-save to save the file.