Click on Command Prompt in the Windows System section. Hold the special Windows key on your keyboard and press the "X" key. Choose "Command Prompt" from the pop-up menu. Hold the Windows key and press the "R" key to get a "Run" window.
The quickest way to open a Command Prompt window is through the Power User Menu, which you can access by right-clicking the Windows icon in the bottom-left corner of your screen, or with the keyboard shortcut Windows Key + X. It'll appear in the menu twice: Command Prompt and Command Prompt (Admin).
MS-DOS and command line overview
| Command | Description | Type |
|---|
| del | Deletes one or more files. | Internal |
| delete | Recovery console command that deletes a file. | Internal |
| deltree | Deletes one or more files or directories. | External |
| dir | List the contents of one or more directory. | Internal |
Command line argument is a parameter supplied to the program when it is invoked. It is mostly used when you need to control your program from outside. Command line arguments are passed to the main() method.
A terminal is an application that allows you to use a shell on your computer. A command line is a synonym for a shell or a terminal. Linux and Mac are fully featured (unix-like) operating systems unlike Windows (which is just dos), and include many GNU programs such as bash and ssh.
Examples of this include the Microsoft Windows, DOS Shell, and Mouse Systems PowerPanel. Command-line interfaces are often implemented in terminal devices that are also capable of screen-oriented text-based user interfaces that use cursor addressing to place symbols on a display screen.
To summarize, the main advantages of a command-line interface include: If you know the commands, a CLI can be a lot faster and efficient than any other type of interface. It can also handle repetitive tasks easily. A CLI requires less memory to use in comparison to other interfaces.
CLI - A computer that's only using the command line takes a lot less of the computer's system resources than a GUI. GUI - A GUI requires more system resources because of the elements that require loading, such as icons and fonts. Video, mouse, and other drivers need to be loaded, taking up additional system resources.
EXECUTING A PYTHON PROGRAM USING COMMAND LINE ARGUMENTS Inputs can be given to the program as arguments at command prompt. Need to write any input function in the program. In the command prompt execute the program using following command py filename.py arg1 arg2 arg3.
Create and Modify Environment Variables on Windows
- On the Windows taskbar, right-click the Windows icon and select System.
- In the Settings window, under Related Settings, click Advanced system settings.
- On the Advanced tab, click Environment Variables.
- Click New to create a new environment variable.
To Check if an Environment Variable ExistsSelect Start > All Programs > Accessories > Command Prompt. In the command window that opens, enter echo %VARIABLE%. Replace VARIABLE with the name of the environment variable.
The most simple way to view the current user variables is to use the System Properties.
- Open the Control Panel.
- Navigate to the following applet: Control PanelSystem and SecuritySystem.
- Click the "Advanced System Settings" link on the left.
- The Environment Variables window will appear on the screen.
An environment variable is a dynamic "object" on a computer, containing an editable value, which may be used by one or more software programs in Windows. Environment variables help programs know what directory to install files in, where to store temporary files, and where to find user profile settings.
The environment variables store data that is used by the operating system and other programs. For example, the WINDIR environment variable contains the location of the Windows installation directory. Programs can query the value of this variable to determine where Windows operating system files are located.
Alternatively, from command shells such as bash, a user can change environment variables for a particular command invocation by indirectly invoking it via env or using the ENVIRONMENT_VARIABLE=VALUE <command> notation. A running program can access the values of environment variables for configuration purposes.
System Environment VariablesSome of the most common environment variables in Windows systems include %path%, %programfiles%, %temp%, and %systemroot%, though there are many others. This way, it can be sure that these important files are installed in the same directory as Windows 8, no matter where that might be.
Windows
- In Search, search for and then select: System (Control Panel)
- Click the Advanced system settings link.
- Click Environment Variables.
- In the Edit System Variable (or New System Variable) window, specify the value of the PATH environment variable.
- Reopen Command prompt window, and run your java code.
To open environment variables settings directly, it is possible to use a special RUNDLL32 command, as described below.
- Press Win + R shortcut keys together on your keyboard. This will open the Run dialog.
- Type the following command in the Run box: rundll32.exe sysdm.cpl,EditEnvironmentVariables.
Commands are a type of sentence in which someone is being told to do something. Command sentences ordinarily, but not always, begin with an imperative (fussy) verb because they tell someone to do something. Examples: " Stop talk! " shouted the teacher.
Following are some of the Command Line Features :
- Command History. History option enables TL1 Agent to record all the commands which are executed in the history list.
- Command Completion.
- Command Line Editing.
- List of Commands.
- Complete Command Syntax.
- Escape Key.
Command sentences are used when you are telling someone to do something. Commands usually start with an imperative verb, also known as a 'bossy verb', because they tell someone to do something.
