15 Popular Command Prompt Tricks & Hacks

Save A List of Files to a Text File by Extension

dir *.ext /s /b > files.txt
This command line will create a file called files.txt. When you open this file, there will be a complete list of all the files in that directory and all subdirectories with the .ext extension. You can then open up this text file in any text editor and work this the information.By changing the ext part, you can select different files. For example, if you wanted to list all of the PDF documents, you would type: 
dir *.pdf /s /b > files.txt

Get Your IP Address Information

ipconfig /all 
This will retrieve a pile of information about your network connection and IP information. From this command, you can get: 

• Host Name
• Primary DNS Suffix
• Node Type
• IP Routing Enabled
• WINS Proxy Enabled
• DNS Suffix Search List
• Connection-specific DNS Suffix
• Network Adapter Description
• Physical (MAC) Address
• DHCP Enabled
• IP Address
• Subnet Mask
• Default Gateway
• DNS Servers

Get Installed Driver Information

driverquery
It can be very useful when troubleshooting to know what drivers are installed on a system. This command will give you a complete listing of the drivers and when they were installed.

Copy Files Via Infrared Port

irftp filename.ext
This will fire up the Wireless Link dialog so that you can copy the specified file via an infrared port.

Find Files Opened By Network Users

openfiles /query
If you are running a system and you want to know who has files open on your computer, this command will provide you a list of those users and the files that they have open.

Note: If you get an error saying The system global flag ‘maintain objects list’ needs to be enabled to see local opened files, you can fix this issue by typing openfiles /local on. You will have to reboot the system but it will resolve the issue.

Monitor Port Activity

netstat -a 30
This will show you all of the TCP/IP ports that are being used on your system and what they are connecting to (or being connected from). It will continue to monitor these ports and refresh the information every 30 seconds. You can change the refresh rate by changing the number at the end of the command.
Tip : Best Tips to Make Firefox 3+ Faster

Recover Information From A Corrupt File

recover filename.ext

If you have a disk with damaged sectors, you can attempt to recover as much information as possible from the damaged file. Data that is not damaged can be retrieved but data in damaged sectors will be lost.

Defragment Remote Computer

rexec remotePC defrag C: /F 
This command used the rexec command to force a defragment of the C: drive on the computer named remotePC. You can use whatever you want to for the command (I just used defrag C: /F as an example). This is very useful for remote maintenance.

Retrieve Detailed System Information

systeminfo
With this command, you can retrieve the following information:

• Host Name
• OS Name
• OS Version
• OS Manufacturer
• OS Configuration
• OS Build Type
• Registered Owner
• Registered Organization
• Product ID
• Original Install Date
• System Up Time
• System Manufacturer
• System Model
• System type
• Processor(s)
• BIOS Version
• Windows Directory
• System Directory
• Boot Device
• System Locale
• Input Locale
• Time Zone
• Total Physical Memory
• Available Physical Memory
• Virtual Memory Max Size
• Virtual Memory Available
• Virtual Memory In Use
• Page File Location(s)
• Domain
• Logon Server
• Hotfix(s)
• NetWork Card(s)

Automatically Defragment C: Daily

schtasks /create /tn "Defrag C" /tr "defrag c: /f" /sc daily /st 23:00:00 /ru "System" 
This will set your computer to automatically perform a complete defrag of the C: drive each day at 11:00:00 PM (23:00:00). It does this by creating a scheduled task called Defrag C. It will run this command under the computer’s system account. 

Map A Drive Letter to a Folder

subst W: C:\windows
Sometimes, your directory structure can get pretty deep and complicated. You can simplify this a bit by mapping a drive letter to commonly used folders. In the example that I have given, this will create a drive letter W: and map it to the C:\windows directory. Then, whenever you go into My Computer, you will see a W: drive and when you browse to it, it will automatically take you to the contents of the C:\windows folder. 
You can do this with any unused drive letter and any folder that exists on your system.

List All Tasks Running On The Computer

tasklist 
It’s always good to know what is running on your system. This is the command line version of the processes tab in Taks Manager. 

Kill A Program

taskkill /im programname.exe /f 
If, when using the tasklist command, you discover that there is something running you just want killed. This is the way to do it! Just note the program name and use it in place of programname.exe. 

Reboot a Remote Computer

shutdown -r -f -m \\remotePC -c "System will be rebooted in 20 seconds" 
Sometimes, you just need to reboot a system. This will do it remotely and give the user a 20 second warning. 
Tip : To open Command Prompt, click Start, click Run, type cmd, and then click OK.