Introduction

Batch scripts can read, write, modify, and delete Windows registry keys using the built-in reg command. This tutorial shows you the safe and practical ways to edit the registry without corrupting the system.

1. Reading Registry Values

reg query "HKCU\Software\Microsoft\Windows\CurrentVersion\Run"
    

HKCU = Current User HKLM = Local Machine (system-wide)

2. Adding a Registry Key

reg add "HKCU\Software\CodeTweakrs" /v UserMode /t REG_SZ /d "Pro" /f
    

• /v → value name
• /t → type (REG_SZ, REG_DWORD, etc.)
• /d → data
• /f → force overwrite

3. Editing an Existing Value

reg add "HKLM\Software\Policies\System" /v DisableCMD /t REG_DWORD /d 0 /f
    

This changes the value if it already exists.

4. Deleting a Value

reg delete "HKCU\Software\CodeTweakrs" /v UserMode /f
    

5. Deleting an Entire Key

reg delete "HKCU\Software\CodeTweakrs" /f
    

6. Example: Disable Windows Lock Screen

reg add "HKLM\Software\Policies\Microsoft\Windows\Personalization" ^
/v NoLockScreen /t REG_DWORD /d 1 /f
    

7. Example: Add Startup Program

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" ^
/v CTTool /t REG_SZ /d "C:\Tools\CTTool.exe" /f
    

8. Tips & Warnings

• Always back up keys before editing.
• HKLM modifications require Administrator privileges.
• Incorrect registry edits can break Windows settings.
• Use reg export to back up.

reg export "HKCU\Software" backup.reg
    

Summary

The reg command is extremely powerful. With it you can automate system tweaks, software configuration, startup control, and advanced system management directly from Batch scripts.