Linux is a computer operating system. There are two kind of user interface. One is Graphical User Interface(GUI) and another one is Command Line Interface(CLI). We all know how to use a GUI. GUI is easy to use, so why bother learning CLI?
One word, Speed! You can do things way faster with CLI than you will ever be able to do with GUI. It is possible to create tens of thousands of folder in few seconds with one simple shell script.
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