ENDLOCAL: Ends localization of environment changes in a batch file.

The `ENDLOCAL` command is used in the Windows Command Prompt to terminate local environment variables initiated with the `SETLOCAL` command. Here are some examples: Example 1: Start and stop local environment:

@ECHO OFF
SETLOCAL
SET Name=John
ECHO Within the local environment: %Name%
ENDLOCAL
ECHO Outside the local environment: %Name%

Description: This example starts a local environment with `SETLOCAL`, defines a local variable (`name`), prints the value inside and outside the local environment, and then ends the local environment with `ENDLOCAL`. Example 2: Using ENDLOCAL in a loop:

@ECHO OFF
FOR /L %%A IN (1, 1, 3) DO (
    SETLOCAL
    SET Counter=%%A
    ECHO Inside the loop: %Counter%
    ENDLOCAL
)
ECHO Out of loop: %Counter%

Description: Here `SETLOCAL` is used inside a loop to create a local environment. `ENDLOCAL` then terminates the local environment at the end of each loop iteration. Example 3: Local environment with return value:

@ECHO OFF
CALL :LocalFunction
ECHO Outside function: %ReturnValue%
GOTO :EOF

:LocalFunction
SETLOCAL
SET ReturnValue=This is a return value
ENDLOCAL & SET ReturnValue=%ReturnValue%
GOTO :EOF

Description: Here a function (`:LocalFunction`) is created that starts a local environment with `SETLOCAL` and ends with `ENDLOCAL`. The return value is used outside the function. Example 4: Using ENDLOCAL in a batch file:

@ECHO OFF
CALL :Start
ECHO Outside function: %GlobalVariable%
GOTO :EOF

:Begin
SETLOCAL
SET GlobalVariable=This is a global variable
CALL :InnerFunction
ENDLOCAL & SET GlobalVariable=%GlobalVariable%
GOTO :EOF

:InnerFunction
SET LocalVariable=This is a local variable
ECHO Inside the function: %LocalVariable%
GOTO :EOF

Description: Here `SETLOCAL` is used in the main function (`:Start`) to create a local environment. In this function a subfunction (`:InnerFunction`) is called. `ENDLOCAL` is used in the main function to exit the local environment while updating the value of the global variable. The `ENDLOCAL` statement terminates the local environment and resets the environment variables to the value before the `SETLOCAL` command. If you want to use an environment variable from the local environment outside of it, you should do so directly after `ENDLOCAL`. Note that local variables are not available outside of their local environment.

Microsoft Windows [Version 10.0.19045.3693]
(c) Copyright 1985-2023 Microsoft Corp.

C:\\WINDOWS>

Ends localization of environment changes in a batch file.
Environment changes made after ENDLOCAL has been issued are
not local to the batch file; the previous settings are not
restored on termination of the batch file.

ENDLOCAL

If Command Extensions are enabled ENDLOCAL changes as follows:

If the corresponding SETLOCAL enable or disabled command extensions
using the new ENABLEEXTENSIONS or DISABLEEXTENSIONS options, then
after the ENDLOCAL, the enabled/disabled state of command extensions
will be restored to what it was prior to the matching SETLOCAL
command execution.

There are a few important points to note when using the `ENDLOCAL` command in the Windows Command Prompt: 1. Local Variables: `ENDLOCAL` terminates a local environment and all local variables created in that environment are discarded. These variables are no longer available outside the localized environment after `ENDLOCAL`. 2. Return Values: If you want to use values ??from a local environment outside of this, you must do so immediately after the `ENDLOCAL` command. Example:

    SETLOCAL
    SET LocalVar=Hello
    ENDLOCAL & SET OutsideVar=%LocalVar%
    

3. Nested `SETLOCAL`/`ENDLOCAL`: If you use `SETLOCAL` multiple times in a batch file, each `SETLOCAL` should be followed by a corresponding `ENDLOCAL`. Each `ENDLOCAL` terminates the next `SETLOCAL` statement. 4. Variable inheritance: Variables created in a localized environment are not inherited to parent environments. Local environments are usually only visible to the current batch process. 5. Execution order: `ENDLOCAL` is executed in the order in which `SETLOCAL` was called. This means that the last localized environment will be terminated first with `ENDLOCAL`. 6. Batch files and functions: In batch files, localized environments are often used in functions. When exiting a function, an `ENDLOCAL` is automatically carried out, unless the function was exited with `GOTO :EOF` or `EXIT /B`. In this case it is advisable to manually add an `ENDLOCAL`. 7. Use in loops: If you use `SETLOCAL` in a loop, a new local environment will be created each time the loop runs. Be sure to place `ENDLOCAL` correctly to ensure local variables are released as needed.

FOR /L %%A IN (1, 1, 3) DO (
    SETLOCAL
    SET LocalVar=Hello
    ECHO %LocalVar%
    ENDLOCAL
)

8. Process Resources: Using `SETLOCAL` and `ENDLOCAL` can help conserve process resources, especially when many variables are defined and used in a batch file. Limiting the scope of variables to specific sections of code allows memory resources to be used more efficiently. In summary, it is important to use `SETLOCAL` and `ENDLOCAL` carefully to ensure that variables are handled properly and localized environments are managed correctly. This is particularly relevant in complex batch scripts or functions.