15 Windows Command Prompt (CMD) Commands You Must Know in 2021

The command prompt is still a powerful Windows tool. Here are the most useful CMD commands every Windows user needs to know.

The command prompt is slowly disappearing from the Windows interface and for good reasons: CMD commands are an antiquated and mostly unnecessary tool from an era of text-based input. But many commands remain useful, and Windows 8 and 10 even added new features.

Here we present the essential commands every Windows user must know.

Windows Command Prompt Commands

1. Assoc

Most files in Windows are associated with a specific program that is assigned to open the file by default. At times, remembering these associations can become confusing. You can remind yourself by entering the command assoc to display a full list of filename extensions and program associations.

2. Cipher

The cipher command, however, wipes a directory by writing random data to it. To wipe your C drive, for example, you’d use the cipher /w:d command, which will wipe free space on the drive. The command does not overwrite undeleted data, so you will not wipe out the files you need by running this command.

3. Driverquery

Drivers remain among the most important software installed on a PC. Improperly configured, missing, or old drivers in Windows can cause all sorts of trouble, so it’s good to have access to a list of what’s on your PC.

4. File Compare

You can use this command to identify differences in text between two files. It’s particularly useful for writers and programmers trying to find small changes between two versions of a file. Simply type fc and then the directory path and file name of the two files you want to compare.

5. Ipconfig

This command relays the IP address that your computer is currently using. However, if you’re behind a router (like most computers today), you’ll instead receive the local network address of the router.

Still, ipconfig is useful because of its extensions. ipconfig /release followed by ipconfig /renew can force your Windows PC into asking for a new IP address, which is useful if your computer claims one isn’t available. You can also use ipconfig /flushdns to refresh your DNS address.

6. Netstat

Entering the command netstat -an will provide you with a list of currently open ports and related IP addresses. This command will also tell you what state the port is in; listening, established, or closed.

7. Ping

Sometimes, you need to know whether or not packets are making it to a specific networked device. That’s where ping comes in handy.

Typing ping followed by an IP address or web domain will send a series of test packets to the specified address. If they arrive and are returned, you know the device is capable of communicating with your PC; if it fails, you know that there’s something blocking communication between the device and your computer. This can help you decide if the root of the issue is an improper configuration or a failure of network hardware.

8. PathPing

This is a more advanced version of ping that’s useful if there are multiple routers between your PC and the device you’re testing. Like ping, you use this command by typing pathping followed by the IP address, but unlike ping, pathping also relays some information about the route the test packets take.

9. Tracert

The tracert command is similar to pathping. Once again, type tracert followed by the IP address or domain you’d like to trace. You’ll receive information about each step in the route between your PC and the target. Unlike pathping, however, tracert also tracks how much time (in milliseconds) each hop between servers or devices takes.

10. Powercfg

Powercfg is a very powerful command for managing and tracking how your computer uses energy. You can use the command powercfg hibernate on and powercfg hibernate off to manage hibernation, and you can also use the command powercfg /a to view the power-saving states currently available on your PC.

Another useful command is powercfg /devicequery s1_supported, which displays a list of devices on your computer that support connected standby. When enabled, you can use these devices to bring your computer out of standby, even remotely.

You can enable this by selecting the device in Device Manager, opening its properties, going to the Power Management tab, and then checking the Allow this device to wake the computer box.

Powercfg /lastwake will show you what device last woke your PC from a sleep state. You can use this command to troubleshoot your PC if it seems to wake from sleep at random.

You can use the powercfg /energy command to build a detailed power consumption report for your PC. The report saves to the directory indicated after the command finishes.

This report will let you know of any system faults that might increase power consumption, like devices blocking certain sleep modes, or poorly configured to respond to your power management settings.

Windows 8 added powercfg /batteryreport, which provides a detailed analysis of battery use, if applicable. Normally output to your Windows user directory, the report provides details about the time and length of charge and discharge cycles, lifetime average battery life, and estimated battery capacity.

11. Shutdown

Windows 8 introduced the shutdown command that, you guessed it, shuts down your computer.

This is, of course, redundant with the already easily accessed shutdown button, but what’s not redundant is the shutdown /r /o command, which restarts your PC and launches the Advanced Start Options menu, which is where you can access Safe Mode and Windows recovery utilities. This is useful if you want to restart your computer for troubleshooting purposes.

12. Systeminfo

This command will give you a detailed configuration overview of your computer. The list covers your operating system and hardware. For example, you can look up the original Windows installation date, the last boot time, your BIOS version, total and available memory, installed hotfixes, network card configurations, and more.

Use systeminfo /s followed by the hostname of a computer on your local network, to remotely grab the information for that system. This may require additional syntax elements for the domain, user name, and password, like this:

systeminfo /s [host_name] /u [domain]\[user_name] /p [user_password]

13. System File Checker

System File Checker is an automatic scan and repair tool that focuses on Windows system files.

You will need to run the command prompt with administrator privileges and enter the command sfc /scannow. If SFC finds any corrupt or missing files, it will automatically replace them using cached copies kept by Windows for this purpose alone. The command can require a half-hour to run on older notebooks.

14. Tasklist

You can use the tasklist command to provide a current list of all tasks running on your PC. Though somewhat redundant with Task Manager, the command may sometimes find tasks hidden from view in that utility.

There’s also a wide range of modifiers. Tasklist -svc shows services related to each task, use tasklist -v to obtain more detail on each task, and tasklist -m will locate DLL files associated with active tasks. These commands are useful for advanced troubleshooting.

Our reader Eric noted that you can “get the name of the executable associated with the particular process ID you’re interested in.” The command for that operation is tasklist | find [process id].

15. Taskkill

Tasks that appear in the tasklist command will have an executable and process ID (a four- or five-digit number) associated with them. You can force stop a program using taskkill -im followed by the executable’s name, or taskkill -pid followed by the process ID. Again, this is a bit redundant with Task Manager, but you can use it to kill otherwise unresponsive or hidden programs.

16. Chkdsk

Windows automatically marks your drive for a diagnostic chkdsk scan when symptoms indicate that a local drive has bad sectors, lost clusters, or other logical or physical errors.

If you suspect your hard drive is failing, you can manually initiate a scan. The most basic command is chkdsk c:, which will immediately scan the C: drive, without a need to restart the computer. If you add parameters like /f, /r, /x, or /b, such as in chkdsk /f /r /x /b c:, chkdsk will also fix errors, recover data, dismount the drive, or clear the list of bad sectors, respectively. These actions require a reboot, as they can only run with Windows powered down.

If you see chkdsk run at startup, let it do its thing. If it gets stuck, however, refer to our chkdsk troubleshooting article.

17. schtasks

Schtasks is your command prompt access to the Task Scheduler, one of many underrated Windows administrative tools. While you can use the GUI to manage your scheduled tasks, the command prompt lets you copy&paste complex commands to set up multiple similar tasks without having to click through various options. Ultimately, it’s much easier to use, once you’ve committed key parameters to memory.

For example, you could schedule your computer to reboot at 11pm every Friday:

schtasks /create /sc weekly /d FRI /tn "auto reboot computer weekly" /st 23:00 /tr "shutdown -r -f -t 10"

To complement your weekly reboot, you could schedule tasks to launch specific programs on startup:

schtasks /create /sc onstart /tn "launch Chrome on startup" /tr "C:\Program Files (x86)\Google\Chrome\Application\Chrome.exe"

To duplicate the above command for different programs, just copy, paste, and modify it as needed.

18. Format

When you need to format a drive, you can either use the Windows File Explorer GUI or you can turn to the command prompt. You’ll need Administrator rights to use this command. Be sure you specify the volume you want to format, followed by the desired parameters.

The command below will quick-format the D drive with the exFAT file system, with an allocation unit size of 2048 bytes, and rename the volume to “label” (without the quotes).

format D: /Q /FS:exFAT /A:2048 /V:label

You can also use this command to dismount a volume (/X) or, if it’s formatted with NTFS, make file compression the default setting (/R). If you’re stuck, use format /? to summon help.

19. prompt

Would you like to customize your command prompt to include instructions or certain information? With the prompt command, you can!

Try this one:

prompt Your wish is my command:

You can add the current time, date, drive and path, Windows version number, and so much more.

prompt $t on $d at $p using $v:

Type “prompt” to reset your command prompt to default settings or just restart the command prompt. Unfortunately, these settings aren’t permanent.

20. cls

Cluttered up your command prompt window trying out all the commands above? There’s one last command you need to know to clean it all up again.

cls

That’s all. Bet Marie Kondo didn’t know that one.

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Windows 8 Only: Recovery Image

Virtually all Windows 8/8.1 computers ship from the factory with a recovery image, but the image may include bloatware you’d rather not have re-installed. Once you’ve uninstalled the software you can create a new image using the recimg command. Entering this command presents a very detailed explanation of how to use it.

You must have administrator privileges to use the recimg command, and you can only access the custom recovery image you create via the Windows 8 refresh feature.

In Windows 10, system recovery has changed. Windows 10 systems don’t come with a recovery partition, which makes it more important than ever to back up your data.