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How to edit a registry using the command line
While regedit can be used on the command line, it is not optimal for granular administrative work. To make repeatable changes to the registry in multiple machines with automation, it's worth looking into switching from regedit to reg, a command-line-based tool included with Windows.
The reg utility offers more expansive functionality to edit subkeys and their values from the command line. Reg is more flexible and works well for a range of administrative scenarios, such as using batch files to correct common issues in client machines and managing the registry on a remote machine.
The reg command has 11 parameters, each with its own set of flags that provide additional functionality. The screenshot shows the help menu for the reg add parameter, which includes its flags and examples of how to use the parameter.
To use reg, type cmd from the Windows run or search box to open the command prompt.
To show all the parameters for the reg command, enter reg /? from the command prompt. Typing reg
/? shows the switches available for the parameter and examples of how to use them.

Parameter	Description
reg add	Inserts a new subkey or entry to the registry. The following example shows how to add a key to remote Windows system named RemotePC: reg add \\RemotePC \HKLM\Software\Test
reg compare	Runs a comparison of specified registry subkeys or entries. The following example compares all values under the named keys: reg compare HKLM\Software\Test\MyApp HKLM\Software\Test\SaveMyApp. If the results are identical, reg will return a 0 code. If the results are different, reg will return a code of 2. If the operation failed, reg will display a code of 1.
reg copy	Copies a registry entry to a specified location on the local or remote computer. Example of use: reg copy \\RemotePC\HKLM\Software\TestKey HKLM\Software\TestKey. The command will copy the TestKey values in the registry from the remote machine named RemotePC to the current machine.
reg delete	Removes a subkey or entries from the registry. Example of use: reg delete HKLM\Software\FakeName\TestApp\Settings. This command deletes the Settings registry key, and any subkeys and settings.
reg export	Exports named subkeys, entries and values of the local computer into a file. Example of use: reg export HKLM\Software\FakeName\TestApp BackupFile.reg. The command makes a copy of the TestApp key and its subkeys and values in a file name BackupFile.reg.
reg import	Copies the contents of a file that contains exported registry subkeys, entries and values into the registry of the local computer. Example of use: reg import BackupFile.reg. The command adds BackupFile.reg registry entries to the machine.
reg load	Writes saved subkeys and entries into a different subkey in the registry. Example of use: reg load HKLM\Test TestHive.hiv. This command will load the TestHive.hiv file into the HKLM\Test key.
reg query	Returns a list of the next tier of subkeys and entries that are located under a specified subkey in the registry. Example of use: reg query HKLM\Software > C:\regoutput.txt. This command outputs the subkeys of HKLM\Software into a file named regoutput.txt in the C:\ folder.
reg restore	Imports subkeys and entries from a file into the registry. Example of use: reg restore HKLM\Software\Microsoft\Test RegBackup.hiv. This command will restore the contents of the RegBackup.hiv file into the Test key.
reg save	Exports specified registry subkeys, entries and values into a named file. Examples of use: reg save HKLM\Software\Test\AppTest BackupFile.hiv. The command saves the AppTest hive to the BackupFile.hiv file.
reg unload	Removes the registry section loaded by the reg load operation. Example of use: reg unload HKLM\TestHive. The command unloads HKLM\TestHive from the registry.