在不重启当前会话的情况下，向路径中添加变量的最简单方法是打开命令提示符并输入:

PATH=(VARIABLE);%path%

并按enter键。

要检查变量是否已加载，请键入

PATH

并按enter键。但是，在重新启动之前，该变量将只是路径的一部分。

这并没有直接回答你的问题，但如果你只是想要进程间通信，你可以使用PowerShell，你可以只使用剪贴板。

在一个过程中

Set-Clipboard (MyText”)

在单独的过程中

$ clipValue = Get-Clipboard

然后你可以使用clipValue作为任何其他字符串。这实际上使您能够使用CSV文本字符串将整个环境变量列表发送到另一个进程

我喜欢巧克力之后的方法，就像匿名懦夫的回答，因为这是一个纯粹的批量处理方法。但是，它会留下一个临时文件和一些临时变量。我给自己做了一个更干净的版本。

在路径的某个地方创建一个文件refreshv .bat。通过执行refreshEnv来刷新控制台环境。

@ECHO OFF
REM Source found on https://github.com/DieterDePaepe/windows-scripts
REM Please share any improvements made!

REM Code inspired by http://stackoverflow.com/questions/171588/is-there-a-command-to-refresh-environment-variables-from-the-command-prompt-in-w

IF [%1]==[/?] GOTO :help
IF [%1]==[/help] GOTO :help
IF [%1]==[--help] GOTO :help
IF [%1]==[] GOTO :main

ECHO Unknown command: %1
EXIT /b 1 

:help
ECHO Refresh the environment variables in the console.
ECHO.
ECHO   refreshEnv       Refresh all environment variables.
ECHO   refreshEnv /?        Display this help.
GOTO :EOF

:main
REM Because the environment variables may refer to other variables, we need a 2-step approach.
REM One option is to use delayed variable evaluation, but this forces use of SETLOCAL and
REM may pose problems for files with an '!' in the name.
REM The option used here is to create a temporary batch file that will define all the variables.

REM Check to make sure we don't overwrite an actual file.
IF EXIST %TEMP%\__refreshEnvironment.bat (
  ECHO Environment refresh failed!
  ECHO.
  ECHO This script uses a temporary file "%TEMP%\__refreshEnvironment.bat", which already exists. The script was aborted in order to prevent accidental data loss. Delete this file to enable this script.
  EXIT /b 1
)

REM Read the system environment variables from the registry.
FOR /F "usebackq tokens=1,2,* skip=2" %%I IN (`REG QUERY "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment"`) DO (
  REM /I -> ignore casing, since PATH may also be called Path
  IF /I NOT [%%I]==[PATH] (
    ECHO SET %%I=%%K>>%TEMP%\__refreshEnvironment.bat
  )
)

REM Read the user environment variables from the registry.
FOR /F "usebackq tokens=1,2,* skip=2" %%I IN (`REG QUERY HKCU\Environment`) DO (
  REM /I -> ignore casing, since PATH may also be called Path
  IF /I NOT [%%I]==[PATH] (
    ECHO SET %%I=%%K>>%TEMP%\__refreshEnvironment.bat
  )
)

REM PATH is a special variable: it is automatically merged based on the values in the
REM system and user variables.
REM Read the PATH variable from the system and user environment variables.
FOR /F "usebackq tokens=1,2,* skip=2" %%I IN (`REG QUERY "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v PATH`) DO (
  ECHO SET PATH=%%K>>%TEMP%\__refreshEnvironment.bat
)
FOR /F "usebackq tokens=1,2,* skip=2" %%I IN (`REG QUERY HKCU\Environment /v PATH`) DO (
  ECHO SET PATH=%%PATH%%;%%K>>%TEMP%\__refreshEnvironment.bat
)

REM Load the variable definitions from our temporary file.
CALL %TEMP%\__refreshEnvironment.bat

REM Clean up after ourselves.
DEL /Q %TEMP%\__refreshEnvironment.bat

ECHO Environment successfully refreshed.

以下是Chocolatey使用的方法。

https://github.com/chocolatey/choco/blob/master/src/chocolatey.resources/redirects/RefreshEnv.cmd

@echo off
::
:: RefreshEnv.cmd
::
:: Batch file to read environment variables from registry and
:: set session variables to these values.
::
:: With this batch file, there should be no need to reload command
:: environment every time you want environment changes to propagate

::echo "RefreshEnv.cmd only works from cmd.exe, please install the Chocolatey Profile to take advantage of refreshenv from PowerShell"
echo | set /p dummy="Refreshing environment variables from registry for cmd.exe. Please wait..."

goto main

:: Set one environment variable from registry key
:SetFromReg
    "%WinDir%\System32\Reg" QUERY "%~1" /v "%~2" > "%TEMP%\_envset.tmp" 2>NUL
    for /f "usebackq skip=2 tokens=2,*" %%A IN ("%TEMP%\_envset.tmp") do (
        echo/set "%~3=%%B"
    )
    goto :EOF

:: Get a list of environment variables from registry
:GetRegEnv
    "%WinDir%\System32\Reg" QUERY "%~1" > "%TEMP%\_envget.tmp"
    for /f "usebackq skip=2" %%A IN ("%TEMP%\_envget.tmp") do (
        if /I not "%%~A"=="Path" (
            call :SetFromReg "%~1" "%%~A" "%%~A"
        )
    )
    goto :EOF

:main
    echo/@echo off >"%TEMP%\_env.cmd"

    :: Slowly generating final file
    call :GetRegEnv "HKLM\System\CurrentControlSet\Control\Session Manager\Environment" >> "%TEMP%\_env.cmd"
    call :GetRegEnv "HKCU\Environment">>"%TEMP%\_env.cmd" >> "%TEMP%\_env.cmd"

    :: Special handling for PATH - mix both User and System
    call :SetFromReg "HKLM\System\CurrentControlSet\Control\Session Manager\Environment" Path Path_HKLM >> "%TEMP%\_env.cmd"
    call :SetFromReg "HKCU\Environment" Path Path_HKCU >> "%TEMP%\_env.cmd"

    :: Caution: do not insert space-chars before >> redirection sign
    echo/set "Path=%%Path_HKLM%%;%%Path_HKCU%%" >> "%TEMP%\_env.cmd"

    :: Cleanup
    del /f /q "%TEMP%\_envset.tmp" 2>nul
    del /f /q "%TEMP%\_envget.tmp" 2>nul

    :: capture user / architecture
    SET "OriginalUserName=%USERNAME%"
    SET "OriginalArchitecture=%PROCESSOR_ARCHITECTURE%"

    :: Set these variables
    call "%TEMP%\_env.cmd"

    :: Cleanup
    del /f /q "%TEMP%\_env.cmd" 2>nul

    :: reset user / architecture
    SET "USERNAME=%OriginalUserName%"
    SET "PROCESSOR_ARCHITECTURE=%OriginalArchitecture%"

    echo | set /p dummy="Finished."
    echo .

我已经用了几年的解决方案:

@echo off
rem Refresh PATH from registry.
setlocal
set USR_PATH=
set SYS_PATH=
for /F "tokens=3* skip=2" %%P in ('%SystemRoot%\system32\reg.exe query "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v PATH') do @set "SYS_PATH=%%P %%Q"
for /F "tokens=3* skip=2" %%P in ('%SystemRoot%\system32\reg.exe query "HKCU\Environment" /v PATH') do @set "USR_PATH=%%P %%Q"
if "%SYS_PATH:~-1%"==" " set "SYS_PATH=%SYS_PATH:~0,-1%"
if "%USR_PATH:~-1%"==" " set "USR_PATH=%USR_PATH:~0,-1%"
endlocal & call set "PATH=%SYS_PATH%;%USR_PATH%"
goto :EOF

编辑:糟糕，这是更新版。

环境变量保存在HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Control\Session Manager\Environment中。

许多有用的环境变量，如Path，都存储为REG_SZ。有几种方法可以访问注册表，包括REGEDIT:

REGEDIT /E <“HKEY_LOCAL_MACHINE \ SYSTEM \ ControlSet001 \会话管理器\ \控制环境”

输出从神奇的数字开始。因此，要用find命令搜索它，它需要输入并重定向:type <filename> | findstr -c:\"Path\"

所以，如果你只是想用系统属性刷新当前命令会话中的路径变量，下面的批处理脚本可以很好地工作:

RefreshPath.cmd:

    @echo off

    REM This solution requests elevation in order to read from the registry.

    if exist %temp%\env.reg del %temp%\env.reg /q /f

    REGEDIT /E %temp%\env.reg "HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment"

    if not exist %temp%\env.reg (
       echo "Unable to write registry to temp location"
       exit 1
       )

    SETLOCAL EnableDelayedExpansion

    for /f "tokens=1,2* delims==" %%i in ('type %temp%\env.reg ^| findstr -c:\"Path\"=') do (
       set upath=%%~j
       echo !upath:\\=\! >%temp%\newpath
       )

     ENDLOCAL

     for /f "tokens=*" %%i in (%temp%\newpath) do set path=%%i