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Commonly mentioned in the Linux (and systems administration) world is the word shell. But what is it?
A shell in the context of Linux is a user interface that allows users to interact with the operating system. It provides a way to execute commands, run programs, and manage files from a command-line interface (CLI) instead of a graphical user interface (GUI).
Types of Shells
There are several types of shells available in Linux, each with its own features. The most common are listed below.
Bash
The Bourne Again SHell, the default shell for many Linux distributions, known for its rich feature set and scripting capabilities.
Zsh
Z Shell, an extended version of Bash with enhanced features such as improved auto-completion and globbing.
Fish
Friendly Interactive SHell, designed for user-friendliness, with syntax highlighting and automatic suggestions.
Tcsh
An enhanced version of the C shell (csh), offering command-line editing and job control. |
Key Functions of a Shell
Let's review why a shell exists in the first place.
Command Execution
You can run commands to perform tasks such as file manipulation, program execution, and system monitoring.
Scripting
Shells allow users to write scripts to automate repetitive tasks, making system administration more efficient.
Environment Management
Users can set and manage environment variables, affecting how processes behave.
Job Control
You can manage running processes, including background tasks and foreground processes.
How to Access the Shell
Open the Terminal
You can typically find the terminal in the applications menu or by using a shortcut like `Ctrl + Alt + T`, using the mouse (click on the terminal icon) or in Gnome, press the Super key -> terminal to start it.
Command Line Interface
Once open, you will see a command prompt where you can type commands.
Basic Commands
Here are some basic commands everyone should know while using the shell.
- ls Lists files and directories.
- cd [directory]: Changes the current directory.
- cp [source] [destination]: Copies files or directories.
- mv [source] [destination]: Moves or renames files or directories.
- rm [file]: Deletes files.
What to learn next
We recommend learning Bash next. Bash is the default shell in most Linux distros, and also default on enterprise Linux distributions such as Ubuntu or RHEL.
Conclusion
The shell is an essential component of Linux, giving users powerful functionalities for interaction without needing a graphical interface. Understanding how to use the shell can greatly enhance productivity and system control. Whether you're a beginner or advanced user, getting comfortable with the shell will improve your efficiency in managing a Linux environment.
