The Linux kernel itself does not include a GUI. However, most Linux distributions have one.
Yes, Linux have a GUI.Today many kind of vendor available in Linux Like Redhat fedora,Ubuntu,Suse, Mandriva and many more. Those Linux version provide Cmd and GUI mode for work.
A terminal is a Command Line Interface (CLI).
You need to be more clear in what type of "interface" you are inquiring about. Linux has it's own API (Application Programming Interface) and ABI (Application Binary Interface). If you are referring to the user interface, Linux can have a GUI, a command line, or even no interface at all.
Many operating systems provide both a command line and a GUI interface. Windows, for instance, is obviously a GUI, however cmd.exe provides access to the underlying command line interface.
iwconfig
How much old do you mean by old? Well, before Gnome and KDE, there was the Command Line Interface (CLI). MCC Interim Linux was the first linux distribution, released in February 1992 used the CLI.
To find the shell on a computer, you can open a terminal or command prompt application. In Windows, you can use Command Prompt or PowerShell, while in Unix-based systems (such as Linux or macOS), you can use the Terminal application. These applications provide a command-line interface to interact with the operating system.
To stop heartbeat in Linux the command line will be service Heartbeat stop To start heartbeat in Linux the command line will be service Heartbeat start
Caller Line Identification, also known as caller ID.
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.
Differentiate between Command line interface and Menus interface and example of each interaction style
False. All of the current generation of operating systems, including Windows, Linux, Android, iOS, Mac OS, Menuet OS, Haiku OS, Chrome OS, and many others all use a graphical user interface as their primary or only interface for the user to interact with. Linux can be configured to use a command line interface, but it is not the default for most any full-sized installation of Linux (e.g. any version of Linux that is installable, including many live CD/DVD setups, that are larger than approximately 100MB in size).
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.