No matter how handy graphical user interfaces are, the good old command line remains a useful tool for performing various low-level data manipulation and system administration tasks. It is the fallback when you need to do something that has no way of graphical control. Being much more expressive and open-ended than a predefined set of controls, the command shell is the ultimate control environment for your computer.
Data science has become one of the most intensely practised computer applications, so it is no wonder that it also benefits greatly from the hands-on control approach of the command line shell.
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