Batch script to manipulate arbitrary Windows environment variables from the command line

batch.properties

PROJECT_ROOT=C:\development
JAVA_VERSION=1.5.0_11
JAVA_HOME=%PROJECT_ROOT%\java%JAVA_VERSION%
ANT_HOME=%PROJECT_ROOT%\tools\apache-ant-1.8.1
PATH=%JAVA_HOME%/bin;%PATH%;%ANT_HOME%/bin;

winvarset.bat

@ECHO OFF
::Sets environment variables
:: Command Extensions must be enabled
:: > CMD /e:on
:: Special thanks to http://ss64.com/nt/

SET PROPERTIES_FILE=batch.properties

IF [%1]==[] GOTO SHOW_HELP
IF /I %1==set GOTO SET_ENVIRONMENT_VARIABLES
IF /I %1==revert GOTO REVERT_ENVIRONMENT_VARIABLES
IF /I %1==clean GOTO CLEAN_ENVIRONMENT_VARIABLES

:SET_ENVIRONMENT_VARIABLES
ECHO Setting environment variables defined in %PROPERTIES_FILE%

FOR /F "TOKENS=1,2 DELIMS==" %%G IN (%PROPERTIES_FILE%) DO (
	CALL :SET_VARIABLES %%G %%H
)
GOTO END

:REVERT_ENVIRONMENT_VARIABLES
ECHO Reverting environment variables to _BACKUP versions
FOR /F "TOKENS=1,2 DELIMS==" %%G IN (%PROPERTIES_FILE%) DO (
	CALL :REVERT_PERSISTANT_VARIABLES %%G %%H
)
GOTO END

:CLEAN_ENVIRONMENT_VARIABLES
ECHO Cleaning defined environment variables
FOR /F "TOKENS=1,2 DELIMS==" %%G IN (%PROPERTIES_FILE%) DO (
	CALL :CLEAN_PERSISTANT_VARIABLES %%G %%H
	CALL :CLEAN_CURRENT_VARIABLES %%G %%H
)
GOTO END

::Looped methods
:SET_VARIABLES
IF NOT "[%1]"=="[]" (
	IF NOT "%2"=="%1" (
		ECHO %1 already set.  Backing up current setting to %1_BACKUP.
		SETX %1_BACKUP %1
	) ELSE (
		ECHO %1 is already set to %2
	)
)
ECHO Setting %1 to %2
CALL SETX %1 %2
CALL SET %1=%2
GOTO:EOF

:REVERT_PERSISTANT_VARIABLES
IF NOT "[%1]"=="[]" (
	IF NOT "%1"=="%1_BACKUP" (
		ECHO Reverting %1 from %2 to %1_BACKUP
		SETX %2 %1_BACKUP
		SET %2=%1_BACKUP
	) ELSE (
		ECHO %1 is already equal to %1_BACKUP
	)
) ELSE (
	SET %1_BACKUP=NOT_SET
)
GOTO:EOF

:CLEAN_PERSISTANT_VARIABLES
ECHO Removing %1
REG delete HKCU\Environment /V %1
GOTO:EOF

:END
CHOICE /C:YN /M "Would you like to close this command window"
IF errorlevel 2 GOTO:EOF
IF errorlevel 1 EXIT 0