Command Prompt: What It Is and How to Use It

Command Prompt is a command line interpreter application available in most Windows operating systems. It's used to execute entered commands. Most of those commands automate tasks via scripts and batch files, perform advanced administrative functions, and troubleshoot or solve certain kinds of Windows issues.

Command Prompt is officially called Windows Command Processor, but it's also sometimes referred to as ​the command shell or cmd prompt, or even by its filename, cmd.exe.

Command Prompt is sometimes incorrectly referred to as "the DOS prompt" or as MS-DOS itself. Command Prompt is a Windows program that emulates many of the command line abilities available in MS-DOS, but it's not MS-DOS.

There are several ways to open Command Prompt, but the "normal" method is via the Command Prompt shortcut located in the Start menu or on the Apps screen, depending on your version of Windows.

The shortcut is faster for most people, but another way to access Command Prompt is via the cmd Run command. You can also open cmd.exe from its original location:

C:\Windows\system32\cmd.exe

Yet another method for opening Command Prompt in some versions of Windows is through the Power User Menu. However, you might see PowerShell there instead of Command Prompt depending on how your computer is set up.

To use Command Prompt, you enter a valid Command Prompt command along with any optional parameters. Command Prompt then executes the command as entered and performs the task or function it's designed to perform in Windows.

For example, executing the following Command Prompt command in your Downloads folder would remove all MP3s from that folder:

del *.mp3

Commands must be entered into Command Prompt exactly. The wrong syntax or a misspelling could cause the command to fail or worse; it could execute the wrong command or the right command in the wrong way. A comfort level with reading command syntax is recommended.

For example, executing the dir command will show a list of files and folders that exist at any specific location on the computer, but it doesn't actually do anything. However, change just a couple letters and it turns into the del command, which is how you delete files from Command Prompt!

Syntax is so important that with some commands, especially the delete command, adding even a single space can mean deleting entirely different data.

Here's an example where the space in the command breaks the line into two sections, essentially creating two commands where the files in the root folder (files) are deleted instead of the files in the subfolder (music):

del C:\files\ music

The proper way to execute that command so as to remove files from the music folder instead is to remove the space so that the whole command is strung together correctly.

Don't let this scare you away from using Command Prompt commands, but definitely let it make you cautious.

A large number of commands exist in Command Prompt, but their availability differs from operating system to operating system. You can view which Command Prompt commands are compatible with a specific operating system here:

• Windows 8 Commands
• Windows 7 Commands
• Windows Vista Commands
• Windows XP Commands

Following those command lists will prove that there are lots and lots of commands you can use in Command Prompt, but not all of them are used as often as others.

Here are some of the more commonly used Command Prompt commands that are utilized in a variety of circumstances: chkdsk, copy, ftp, del, format, ping, attrib, net, dir, help, and shutdown.

Command Prompt is available on every Windows NT-based operating system which includes Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, and Windows 2000, as well as Windows Server 2012, 2008, and 2003.

Windows PowerShell, an advanced command line interpreter available in recent Windows versions, supplements the command executing abilities available in Command Prompt. Windows PowerShell may eventually replace the Command Prompt in a future version of Windows.