Command line

Introduction
Command-line, also referred to as terminal, is an interface for advanced Linux user for using and managing the system. The interface is simplistic, often black colored background with a white cursor, where the user issues the various commands to perform desired tasks.

Some commands
Some example commands are:
 * cd - used to change the current directory to a desired location

Usage: cd /home/john
 * ls - list contents of the current directory

Usage: ls
 * mkdir - make a new directory

Usage: mkdir /home/john/data

Terminal Emulators
Most of the well-known window managers come with their own terminal emulator. A terminal emulator is an interface to the command-line whose appearance is compatible to the window manager / desktop environment that contains it.

Some of the popular terminal emulators are:
 * Konsole - KDE
 * Terminal - GNOME
 * Xterm - default for the X Window System