Distribution: ---
Downgrade: the contrary of an upgrade. It is less common than the upgrade, in fact, it could seem silly to go back to an older version of a software, often with more bugs and less features. Yet, in the Linux world, downgrades are often indispensable, if you try new unstable versions of software and you want to pass to older but stable versions or if a new version have conflicts with other programs.GUI: Graphical User Interface - is a tool that bring a command-based program into the graphic mode, allowing to use the mouse and other visual facilities. Basically, everything we see and click is a GUI that allow the user to interact easily with the core of the program. Easy example: file movements can be made using the terminal (with the mv command) or using a GUI (such as Nautilus file browser) with the easy drag and drop.
Man: it stands for manual, and it is a command that shows the manual page for a specific command including syntax, explanations, options and examples. You will be surprised by how often it will help you understanding some commands!
Open Source: is a software with its source code published and free to be modified, and then, improved. There are a lot of advantages using open source software, since it can be modified and debugged by anyone. This term ought not to be confused with "free". A program can be free (of costs) but closed source and viceversa. Yet, an open source program is often free.
Operative System (OS): ---
Upgrade: an upgrade is the action of updating a program (or even a hardware) to a newer version. This will happen a lot with Linux, since it is in continuous development, especially regarding the software open-source.Yum: yum is a easy-to-use software packet manager for the terminal (there are some GUIs, though) that allows the user to directly and automatically download, install, and keep up to date programs. The list of programs is kept and updated in the repositories. The convenience of this program consists in having all the programs installed and updated under one manager. Some distributions (such as Fedora) have it installed by default.
*** Post in continuous development ***
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