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Shell

A shell is a command-line interface (CLI) used to interact with the operating system. It allows users to execute commands, run scripts, and manage system resources. Shells can be either command-line based or graphical. The most common types of shells are:

  1. Bourne Shell (sh): The original Unix shell developed by Stephen Bourne.

  2. Bash (Bourne Again Shell): An enhanced version of the Bourne Shell, widely used in Linux and macOS.

  3. C Shell (csh): A Unix shell with C-like syntax, developed by Bill Joy.

  4. Korn Shell (ksh): A Unix shell developed by David Korn, combining features of the Bourne Shell and C Shell.

  5. Z Shell (zsh): An extended Bourne Shell with many improvements and features.

Shells provide various functionalities, including:

  • Command Execution: Running system commands and applications.

  • Scripting: Writing and executing shell scripts to automate tasks.

  • Environment Management: Setting and managing environment variables.

  • File Manipulation: Creating, deleting, and modifying files and directories.

  • Process Control: Managing running processes and jobs.

Shells are essential tools for system administrators, developers, and power users to efficiently manage and automate system tasks.

Last modified: 25 November 2024