X11

X11 is a computer software and network protocol that provides Graphical User Interphase(GUI) for users. It is a standard on Unix, Linux and other Unix-like operating system, and many other operating systems. X11 provides basic functions for a GUI: drawing, moving windows, interacting with mouse cursor, it doesn't provide features of a user interface buttons, menus, title bar of window, these features are provided by softwares such as window managers, GUI widgets toolkit.

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Change the screen resolution thru commandline, using xrandr

Once I changed my screen's resolution to a very small value and as a result I wasn't able to see the drop down box of the GUI application to change it back. This was when I came to know about Xrandr, a great command line application to configure X11 server. Well, there are a lot of things it can do but if you ever want to change the resolution, use this command.

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