The Windows Registry explains

Registry storage Structure:

The entire registry content consists primarily of items (keys), values (key values). (Open the registry via the regedit command)

5 a root key:

HKEY_CLASSES_ROOT (abbreviated HKCR)

HKEY_CURRENT_USER (abbreviated HKCU)

HKEY_LOCAL_MACHINE (abbreviated HKLM)

HKEY_USERS (abbreviated HKU)

Hkey_current_config (abbreviated HKCC)

Key values:

It consists of three parts, name, type, data.

Health value type:

Key value types are made up of 6 commonly used

String Value (REG_SZ)

Binary Value (REG_BINARY)

32-bit value (4 bytes) (REG_DWORD)

64-bit value (5 bytes) (Reg_qword)

Multi-string value (REG_MULTI_SZ)

Expandable String Value (REG_EXPAND_SZ)

Using the DOS command reg to operate the registry

The Reg command is provided by Windows, which can add, change, and display registry subkey information and values in a registry key.

REG ADD

Adds a new subkey or item to the registry.

Grammar:

REG ADD KeyName [/V entryname|/ve] [/t DataType] [/s separator] [/D value] [/f]

Parameters

KeyName

Specifies the full path of the subkey. For a remote computer, include the computer name before the subkey path in//computername/pathtosubkey. Ignoring ComputerName can result in default

Operation on the local computer. Start the path in the appropriate subtree. Valid subtree is HKLM, HKCU, HKCR, HKU, and HKCC.

/V

Specifies the name of the item to add to the specified subkey.

/ve

Specifies that entries added to the registry are null values.

/t

Specifies the data type of the item value. The DataType can be of several types:

/s

Specifies the characters used to separate multiple data instances. Use this parameter when REG_MULTI_SZ is specified as a data type and you need to list multiple items. If not specified, the default delimiter is used

Identifier/.

/d

Specifies the value of the new registry key.

/F

Add a subkey or item directly without asking for information.

Test Pass DOS command to modify the system boot warm tips.

Create a Test.bat script file, copy the following command:

@echo off

REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon"/V legalnoticecaption/t reg_sz/d Warm tips/F

REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon"/V legalnoticetext/t reg_sz/d Leave your desk to sleep!!! /F

Gpupdate/force

Exit

Double-click Run Test.bat after the script, log off the system, with the effect as follows:

The Windows Registry explains