What is Command Processor?

Command Processor
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What is Command Processor?

This is the part of the operating system that receives and executes the operating system commands. Every operating system has a command processor. When a command prompt is displayed, then this command processor is waiting for a command. When you enter a command, the command processor analyzes the syntax of that command to make sure that the command is valid or not, and then either executes that command or issues an error warning. .

Whereas in operating systems that have a graphical user interface, this command processor interprets mouse operations and executes the appropriate commands.

Another name for command processor is command line interpreter.

What is the Technical Definition of Command Processor

A command processor is a program (which is written in assembler language, PL/1, or compiled and linked in a load module) that receives control when a user receives a command name in a terminal. enters. Control is provided by the terminal monitor program (TMP), which is a program that provides an interface between terminal users and command processors, and has access to many system services.

The main difference between Command Processor and other programs is that when a command processor is invoked, a command processor parameter list (CPPL) is passed to it and which provides access to the program by the caller and Information about other system services.

Command processors must communicate with the user in the terminal, as well as respond to abnormal terminations and attention interruptions. Command processors very easily recognize the subcommand names entered by the terminal user and it then loads and passes control to the appropriate subcommand processor.

What is Command Line Interpreter

A command line interpreter is a program that allows commands to be entered and then to execute those commands in the operating system. Or you can say that it is literally the interpreter of commands.

A program that has a graphical user interface (GUI) such as buttons and menus that are controlled by a mouse, while a command line interpreter accepts lines of text as commands from a keyboard. And then they are converted into functions that only the operating system can understand.

A command line interpreter program is generally referred to in a command line interface. Its other names are CLI, command language interpreter, console user interface, command processor, shell, command line shell, and a command interpreter.

Why are Command Line Interpreters used?

If it can be controlled in a computer with easy-to-use applications that have a graphical interface, then you must be wondering why someone would need a command line to enter commands. Well, there are mainly three main reasons for this, about which we will know.

The first reason is that you can automate commands. There are many examples of this, such as a script that always shutdowns certain services or programs when the user first logs in. The second is that if you want, you can copy the similar file format, so that you will not have to shift from one place to another again and again. All these things can be done fast and automatically with the use of commands.

Another benefit is that by using a command line interpreter, you have direct access to the functions of the operating system. Advanced users may prefer the command line interface if they want, as this concise and powerful access provides them with the facilities they need. On the other hand, new users or inexperienced users may find it difficult because it requires experience. The commands available in this are not as common as they used to be in menus and buttons.

The third benefit is that we can use command line interpreters when we have a large number of commands and options to control the operating system, but we do not understand how to do it. It may be that the GUI software that is in the operating system is simply not built in to utilize those commands. Also a command line interpreter helps you to use some of those commands, not all commands at once. This makes them more beneficial in systems in which you have less resources to run graphical programs.

More information about Command Line Interpreters
In most Windows operating systems, the primary command line interpreter is the Command Prompt. By the way, Windows PowerShell is an even more advanced command line interpreter available with Command Prompt in recent versions of Windows.

In Windows XP and Windows 2000, a special diagnostic tool called Recovery Console acted as a command line interpreter and performed many troubleshooting and system repair tasks.

The command line interface of the macOS operating system is called Terminal.

Many times it has been seen that both a command line interface and a graphical user interface are included in the same program. When such a case occurs then it is typical for an interface to support some functions which are not available in others. This is often the command line portion in which more features have to be included because it provides raw access to application files and is not limited to what the software developer chooses to include in the GUI.