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What Is the Bash Shell, and Why Is It So Important to Linux?

What Is the Bash Shell, and Why Is It So Important to Linux?
What Is a Shell?
When you open a terminal window and type commands, something has to take what you’ve typed, figure out what you intended, and run the tasks you asked for. The software that does this is the shell. A shell is a command interpreter. It scans what you’ve typed and picks out the commands, directory names, file names, and program names so that it can figure out what you’re trying to achieve.
People often use the phrases “terminal windows,” “command line,” and “shell” interchangeably, but they’re three distinct things. A terminal window is a software representation of a physical teletype terminal. It gives you a connection to the computer. In order to do anything useful, you must be able to type instructions at a command line. The command line is provided by the shell, and the terminal window lets you access the shell. ....

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Shell Shopping » Linux Magazine

Author(s): Joe Casad
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Author(s): Tim Schürmann
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Author(s): and Harald Zisler
Don t let your familiarity with the Bash shell stop you from exploring other options. We take a look at a pair of alternatives that are easy to install and easy to use: Zsh and fish.
When you open a terminal window and start typing a text-based command, you are interacting with a command shell or command line interface (CLI). A shell is a program that acts as an interface to a command processor, the component that carries out commands by interacting with the underlying system.
Some of the command shells around today predate the birth of Linux and were originally used on classic Unix systems (see the box entitled A Little History ). The most popular shell for Linux systems in the Bourne Again Shell, which is known universally as Bash [ ....

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