Several different versions of UNIX have GUI's or Graphical User Interfaces.
The most common example of UNIX with an interface is Mac OS X.
Unix is an Operating System, managing the hardware resources of a system. You can interact with Unix via the command line interface or via a graphical interface.
As most modern day Operating Systems Unix has both a GUI and a command line interface.
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Yes try UBUNTU linux.
Yes, Unix has several variants of Graphical User Interfaces that may be used instead of the command line if the user wishes it.
Traditionally, the UNIX command interface was the only way to communicate within a UNIX system. Today, that is not true, with the graphical interfaces that are available. However, the true power of what you can do within UNIX is still in the command line interface. The command line interface is not very intuitive, and uses commands that are abbreviated to the point of not necessarily being understandable. Also, system administration tasks in Unix have typically been harder to accomplish because of the amount of background knowledge necessary even to do simple things. UNIX was developed early on for programmers by programmers, and little thought was given to the end user; as a result, it had a reputation of being difficult to use until you took the time to understand the (admittedly) arcane command line interface.
Unix and Unix-like systems would be referred to as command interpreters because of the nature of their interface. These systems are interacted with via a shell (i.e. Bash), which is a 'command-line interface' where the user types in text commands and they are executed by the system. This is in contrast with modern operating systems where the primary method of interaction is via a 'graphical user interface' or GUI, where the system is represented with graphics (like windows, cursors, toolbars etc.). These modern OS's still include command-line interfaces, like Command Prompt in Windows and the Terminal in OSX.
iwconfig
Caller Line Identification, also known as caller ID.
Differentiate between Command line interface and Menus interface and example of each interaction style
The term "command line interface' is not actually used to describe an operating system, but a type of shell around an operating system. A command line interface is an interface in which you enter commands, arguments and parameters as your primary method of running programs or doing work. Depending on the operating system, the CLI may be the primary method of interfacing with the operating system. Linux (And most Unix/Unix-like systems.) can be primarily CLI driven or GUI driven, since shells are treated as just another application in those systems.
Ifconfig stands for interface configuration. It is a system administration utility in Unix-like operating systems to configure, control and query TCP/IP network interface parameters from a command line interface or in system configuration scripts.
The a default Unix shell is the shell that comes with and is activated initially with your distribution of Unix. The shell is essentially the program the runs the command line interface allowing someone to interact with their computer. Some examples are the Bourne-Again shell (bash) or the Bourne shell (sh).
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PuTTY is a program for Microsoft Windows that allows you to control a computer running a Linux or Unix-based operating system via SSH using a command-line interface.
You can log in via telnet or ssh protocol for a command line prompt environment to Unix, or you can use a graphical user interface such as KDE or Gnome, or the CDE environment via X-windows. In any of these protocols, you must supply a username and password to successfully log into the Unix system.