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Command line tools are software applications that are designed to be run in a command-line interface, also known as a terminal or shell. They allow users to interact with their operating system and perform various tasks without the need for a graphical user interface.

Command line tools are lightweight and efficient, as they typically have a smaller footprint compared to their graphical counterparts. They are often used by developers, system administrators, and power users who require more control and flexibility when performing tasks.

Command line tools can be written in various programming languages, such as C, Python, Ruby, or JavaScript. They can accomplish a wide range of functions, from file manipulation and text processing to network management and system administration.

When using a command line tool, the user enters commands and options into a text-based interface, which then executes the desired action. The output is typically displayed directly in the terminal window or saved to a file.

To use a command line tool, the user needs to have a basic understanding of the command line syntax and be familiar with the available commands and options. Many command line tools provide a built-in help system, allowing users to access documentation or get assistance on how to use specific functionalities.

Command line tools can be highly customizable, as users can extend their functionality by creating scripts or utilizing command line arguments. They also offer the ability to automate repetitive tasks by creating batch scripts or using piping, which allows the output of one command to be directly used as input for another.

Some popular command line tools include grep, sed, awk, curl, git, and many others. They are often bundled with operating systems or available for download from official repositories or developer websites.

Command line tools have a long history and are still widely used today, especially in the field of software development and system administration. They provide powerful capabilities and are known for their speed and efficiency.

While command line tools can have a steep learning curve for beginners, mastering them can greatly enhance productivity and allow for more advanced control over a system or application.