Components of a Linux Desktop Environment

There are many different "desktop environments" available within Linux including but not limited to Unity, Cinnamon, GNOME, KDE, XFCE, LXDE, and Enlightenment.

This list highlights the components which are commonly used to make a "desktop environment."

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Window Manager

A "Window Manager" determines how applications are presented to the user on the screen.

There are different types of "Window Manager" available:

Compositing
Stacking
Tiling

Modern desktop environments use compositing to display windows. Windows can appear on top of each other and snap side by side and look pleasing to the eye.

A stacking "window manager" lets you place windows on top of each other but they look more old-fashioned.

A tiling "window manager" puts windows side by side without letting them overlap.

Typically a "window" can have borders, it can be minimized and maximized, resized and dragged around the screen. The "window" will have a title, may contain a context menu and items can be selected with the mouse.

A "window manager" lets you tab between windows, send them to a taskbar (also known as a panel), snap the windows side by side and perform other tasks.

You can generally set the desktop wallpaper and add icons to the desktop.

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Panels

Those of you used to the Windows operating system will think of a "panel" as being a "taskbar".

Within Linux, you can have multiple panels on the screen.

A "panel" generally sits on the edge of the screen either at the top, bottom, left or right.

The "panel" will contain items such as a menu, quick launch icons, minimized applications, and a system tray or notification area.

Another use of a "panel" is as a docking bar which provides quick launch icons to load commonly used applications.

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System Tray

A "system tray" is generally attached to a panel and provides access to key settings:

Audio
Network
Power
User
Bluetooth
Notifications
Clock

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Icons

"Icons" provide instant access to applications.

An "icon" links to a file with a ".desktop" extension which provides a link to an executable program.

The ".desktop" file also contains the path to the image to use for the icon as well as the category for the application which is used in menus.

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Widgets

Widgets provide useful information to the user straight to the desktop.

Common widgets provide system information, news, sports results, and the weather.

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Launcher

Unique to Unity and the GNOME desktop a launcher provides a list of quick launch icons which when clicked load the linked application.

Other desktop environments allow you to create panels or docks which can include launchers to provide the same functionality.

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Dashboards

The Unity and GNOME desktop environments include a dash style interface which can be displayed by pressing the super key (on most laptops this is a key with the Windows logo).

The "dash" style interface provides a series of icons in categories which when clicked pull up the linked application.

A powerful search facility is usually included as well to make it easy to find applications.

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File Manager

A file manager is required to allow you to navigate the file system so that you can edit, copy, move and delete files and folders.

Typically you will see a list of common folders such as home, pictures, documents, music, and downloads. Clicking on a folder shows the items within the folder.

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Terminal Emulator

A terminal emulator lets a user run low-level commands against the operating system.

The command line provides more powerful features than traditional graphical tools.

You can do most things in the command line that you can with graphical tools but the increased number of switches provide a lower level of granularity.

The command line makes running repetitive tasks simpler and less time to consume.

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