Use command-line options to edit registries with regedit exe

Command-line options and syntax for regedit.exe
You can regedit with either hotkeys or a mouse, but the utility has several command-line options for basic registry work.

regedit	filename.reg	Imports a registry file into the Windows registry.
regedit	/c filename.reg	Create a new registry file and replace existing entries in the Windows registry.
regedit	/d registry-subkey	Removes a subkey from the registry, such as regedit /d HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default.
regedit	/e	Exports the entire registry to a file. You can modify this command to add a filename and specific location on the drive, such as regedit /e c:\AllRegistryEntries.reg. You can export a specific key with the following example command regedit /e keybackup.reg HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Edge.
regedit	/l: system	Specify the location of the SYSTEM.DAT file used in legacy Windows operating systems and typically stored in the C:\Windows folder. This file stores the data kept in the HKEY_LOCAL_MACHINE key in the registry.
regedit	/r:user	Specify the location of the NTUSER.DAT file to use. This is the backup of the HKEY_USERS key in the registry. The file is typically found in the C:\Users\username folder.
regedit	/m	Opens an additional regedit instance, which can be helpful when troubleshooting to compare registry entries.
regedit	/s	Silent mode. Performs an action without stopping for confirmation with dialog box.