如果修改或添加环境变量，则必须重新启动命令提示符。是否有一个命令，我可以执行，将这样做而不重新启动CMD?
当前回答
我使用这个Powershell脚本添加到PATH变量中。 只要稍加调整，我相信它也适用于你的情况。
#REQUIRES -Version 3.0
if (-not ("win32.nativemethods" -as [type])) {
# import sendmessagetimeout from win32
add-type -Namespace Win32 -Name NativeMethods -MemberDefinition @"
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern IntPtr SendMessageTimeout(
IntPtr hWnd, uint Msg, UIntPtr wParam, string lParam,
uint fuFlags, uint uTimeout, out UIntPtr lpdwResult);
"@
}
$HWND_BROADCAST = [intptr]0xffff;
$WM_SETTINGCHANGE = 0x1a;
$result = [uintptr]::zero
function global:ADD-PATH
{
[Cmdletbinding()]
param (
[parameter(Mandatory=$True, ValueFromPipeline=$True, Position=0)]
[string] $Folder
)
# See if a folder variable has been supplied.
if (!$Folder -or $Folder -eq "" -or $Folder -eq $null) {
throw 'No Folder Supplied. $ENV:PATH Unchanged'
}
# Get the current search path from the environment keys in the registry.
$oldPath=$(Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH).Path
# See if the new Folder is already in the path.
if ($oldPath | Select-String -SimpleMatch $Folder){
return 'Folder already within $ENV:PATH'
}
# Set the New Path and add the ; in front
$newPath=$oldPath+';'+$Folder
Set-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH -Value $newPath -ErrorAction Stop
# Show our results back to the world
return 'This is the new PATH content: '+$newPath
# notify all windows of environment block change
[win32.nativemethods]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE, [uintptr]::Zero, "Environment", 2, 5000, [ref]$result)
}
function global:REMOVE-PATH {
[Cmdletbinding()]
param (
[parameter(Mandatory=$True, ValueFromPipeline=$True, Position=0)]
[String] $Folder
)
# See if a folder variable has been supplied.
if (!$Folder -or $Folder -eq "" -or $Folder -eq $NULL) {
throw 'No Folder Supplied. $ENV:PATH Unchanged'
}
# add a leading ";" if missing
if ($Folder[0] -ne ";") {
$Folder = ";" + $Folder;
}
# Get the Current Search Path from the environment keys in the registry
$newPath=$(Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH).Path
# Find the value to remove, replace it with $NULL. If it's not found, nothing will change and you get a message.
if ($newPath -match [regex]::Escape($Folder)) {
$newPath=$newPath -replace [regex]::Escape($Folder),$NULL
} else {
return "The folder you mentioned does not exist in the PATH environment"
}
# Update the Environment Path
Set-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH -Value $newPath -ErrorAction Stop
# Show what we just did
return 'This is the new PATH content: '+$newPath
# notify all windows of environment block change
[win32.nativemethods]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE, [uintptr]::Zero, "Environment", 2, 5000, [ref]$result)
}
# Use ADD-PATH or REMOVE-PATH accordingly.
#Anything to Add?
#Anything to Remove?
REMOVE-PATH "%_installpath_bin%"
其他回答
重新启动资源管理器为我做到了这一点，但只对新的cmd终端。
我设置路径的终端已经可以看到新的path变量了(在Windows 7中)。
taskkill /f /im explorer.exe && explorer.exe
我想到的最好的方法是只做一个Registry查询。下面是我的例子。
In my example I did an install using a Batch file that added new environment variables. I needed to do things with this as soon as the install was complete, but was unable to spawn a new process with those new variables. I tested spawning another explorer window and called back to cmd.exe and this worked but on Vista and Windows 7, Explorer only runs as a single instance and normally as the person logged in. This would fail with automation since I need my admin creds to do things regardless of running from local system or as an administrator on the box. The limitation to this is that it does not handle things like path, this only worked on simple enviroment variables. This allowed me to use a batch to get over to a directory (with spaces) and copy in files run .exes and etc. This was written today from may resources on stackoverflow.com
原批处理调用新批处理:
testenvget。cmd SDROOT(或任何变量)
@ECHO OFF
setlocal ENABLEEXTENSIONS
set keyname=HKLM\System\CurrentControlSet\Control\Session Manager\Environment
set value=%1
SET ERRKEY=0
REG QUERY "%KEYNAME%" /v "%VALUE%" 2>NUL| FIND /I "%VALUE%"
IF %ERRORLEVEL% EQU 0 (
ECHO The Registry Key Exists
) ELSE (
SET ERRKEY=1
Echo The Registry Key Does not Exist
)
Echo %ERRKEY%
IF %ERRKEY% EQU 1 GOTO :ERROR
FOR /F "tokens=1-7" %%A IN ('REG QUERY "%KEYNAME%" /v "%VALUE%" 2^>NUL^| FIND /I "%VALUE%"') DO (
ECHO %%A
ECHO %%B
ECHO %%C
ECHO %%D
ECHO %%E
ECHO %%F
ECHO %%G
SET ValueName=%%A
SET ValueType=%%B
SET C1=%%C
SET C2=%%D
SET C3=%%E
SET C4=%%F
SET C5=%%G
)
SET VALUE1=%C1% %C2% %C3% %C4% %C5%
echo The Value of %VALUE% is %C1% %C2% %C3% %C4% %C5%
cd /d "%VALUE1%"
pause
REM **RUN Extra Commands here**
GOTO :EOF
:ERROR
Echo The the Enviroment Variable does not exist.
pause
GOTO :EOF
还有另一种方法，我从各种不同的想法中想出的。请看下文。这基本上会得到最新的路径变量从注册表然而，这将导致一些问题，因为注册表查询将给出变量本身，这意味着到处都有一个变量，这将不会工作，所以为了解决这个问题，我基本上加倍的路径。非常讨厌的。更可取的方法是: 设置路径=%路径%;C:\Program Files\Software....\
不管这是新的批处理文件，请谨慎使用。
@ECHO OFF
SETLOCAL ENABLEEXTENSIONS
set org=%PATH%
for /f "tokens=2*" %%A in ('REG QUERY "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v Path ^|FIND /I "Path"') DO (
SET path=%%B
)
SET PATH=%org%;%PATH%
set path
我做了一个更好的替代Chocolatey refreshenv cmd和cygwin，解决了很多问题，如:
The Chocolatey refreshenv is so bad if the variable have some cmd meta-characters, see this test: add this to the path in HKCU\Environment: test & echo baaaaaaaaaad, and run the chocolatey refreshenv you will see that it prints baaaaaaaaaad which is very bad, and the new path is not added to your path variable. This script solve this and you can test it with any meta-character, even something so bad like: ; & % ' ( ) ~ + @ # $ { } [ ] , ` ! ^ | > < \ / " : ? * = . - _ & echo baaaad refreshenv adds only system and user environment variables, but CMD adds volatile variables too (HKCU\Volatile Environment). This script will merge all the three and remove any duplicates. refreshenv reset your PATH. This script append the new path to the old path of the parent script which called this script. It is better than overwriting the old path, otherwise it will delete any newly added path by the parent script. This script solve this problem described in a comment here by @Gene Mayevsky: refreshenv modifies env variables TEMP and TMP replacing them with values stored in HKCU\Environment. In my case I run the script to update env variables modified by Jenkins job on a slave that's running under SYSTEM account, so TEMP and TMP get substituted by %USERPROFILE%\AppData\Local\Temp instead of C:\Windows\Temp. This breaks build because linker cannot open system profile's Temp folder.
我为cmd和cygwin/bash做了一个脚本， 你可以在这里找到他们:https://github.com/badrelmers/RefrEnv
对cmd
这个脚本使用vbscript，所以它可以在所有windows版本xp+
要使用它，将其保存为refrenv.bat并调用call refrenv.bat
<!-- : Begin batch script
@echo off
REM PUSHD "%~dp0"
REM author: Badr Elmers 2021
REM description: refrenv = refresh environment. this is a better alternative to the chocolatey refreshenv for cmd
REM https://github.com/badrelmers/RefrEnv
REM https://stackoverflow.com/questions/171588/is-there-a-command-to-refresh-environment-variables-from-the-command-prompt-in-w
REM ___USAGE_____________________________________________________________
REM usage:
REM call refrenv.bat full refresh. refresh all non critical variables*, and refresh the PATH
REM debug:
REM to debug what this script do create this variable in your parent script like that
REM set debugme=yes
REM then the folder containing the files used to set the variables will be open. Then see
REM _NewEnv.cmd this is the file which run inside your script to setup the new variables, you
REM can also revise the intermediate files _NewEnv.cmd_temp_.cmd and _NewEnv.cmd_temp2_.cmd
REM (those two contains all the variables before removing the duplicates and the unwanted variables)
REM you can also put this script in windows\systems32 or another place in your %PATH% then call it from an interactive console by writing refrenv
REM *critical variables: are variables which belong to cmd/windows and should not be refreshed normally like:
REM - windows vars:
REM ALLUSERSPROFILE APPDATA CommonProgramFiles CommonProgramFiles(x86) CommonProgramW6432 COMPUTERNAME ComSpec HOMEDRIVE HOMEPATH LOCALAPPDATA LOGONSERVER NUMBER_OF_PROCESSORS OS PATHEXT PROCESSOR_ARCHITECTURE PROCESSOR_ARCHITEW6432 PROCESSOR_IDENTIFIER PROCESSOR_LEVEL PROCESSOR_REVISION ProgramData ProgramFiles ProgramFiles(x86) ProgramW6432 PUBLIC SystemDrive SystemRoot TEMP TMP USERDOMAIN USERDOMAIN_ROAMINGPROFILE USERNAME USERPROFILE windir SESSIONNAME
REM ___INFO_____________________________________________________________
REM :: this script reload environment variables inside cmd every time you want environment changes to propagate, so you do not need to restart cmd after setting a new variable with setx or when installing new apps which add new variables ...etc
REM This is a better alternative to the chocolatey refreshenv for cmd, which solves a lot of problems like:
REM The Chocolatey refreshenv is so bad if the variable have some cmd meta-characters, see this test:
REM add this to the path in HKCU\Environment: test & echo baaaaaaaaaad, and run the chocolatey refreshenv you will see that it prints baaaaaaaaaad which is very bad, and the new path is not added to your path variable.
REM This script solve this and you can test it with any meta-character, even something so bad like:
REM ; & % ' ( ) ~ + @ # $ { } [ ] , ` ! ^ | > < \ / " : ? * = . - _ & echo baaaad
REM refreshenv adds only system and user environment variables, but CMD adds volatile variables too (HKCU\Volatile Environment). This script will merge all the three and remove any duplicates.
REM refreshenv reset your PATH. This script append the new path to the old path of the parent script which called this script. It is better than overwriting the old path, otherwise it will delete any newly added path by the parent script.
REM This script solve this problem described in a comment by @Gene Mayevsky: refreshenv modifies env variables TEMP and TMP replacing them with values stored in HKCU\Environment. In my case I run the script to update env variables modified by Jenkins job on a slave that's running under SYSTEM account, so TEMP and TMP get substituted by %USERPROFILE%\AppData\Local\Temp instead of C:\Windows\Temp. This breaks build because linker cannot open system profile's Temp folder.
REM ________
REM this script solve things like that too:
REM The confusing thing might be that there are a few places to start the cmd from. In my case I run cmd from windows explorer and the environment variables did not change while when starting cmd from the "run" (windows key + r) the environment variables were changed.
REM In my case I just had to kill the windows explorer process from the task manager and then restart it again from the task manager.
REM Once I did this I had access to the new environment variable from a cmd that was spawned from windows explorer.
REM my conclusion:
REM if I add a new variable with setx, i can access it in cmd only if i run cmd as admin, without admin right i have to restart explorer to see that new variable. but running this script inside my script (who sets the variable with setx) solve this problem and i do not have to restart explorer
REM ________
REM windows recreate the path using three places at less:
REM the User namespace: HKCU\Environment
REM the System namespace: HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
REM the Session namespace: HKCU\Volatile Environment
REM but the original chocolatey script did not add the volatile path. This script will merge all the three and remove any duplicates. this is what windows do by default too
REM there is this too which cmd seems to read when first running, but it contains only TEMP and TMP,so i will not use it
REM HKEY_USERS\.DEFAULT\Environment
REM ___TESTING_____________________________________________________________
REM to test this script with extreme cases do
REM :: Set a bad variable
REM add a var in reg HKCU\Environment as the following, and see that echo is not executed. if you use refreshenv of chocolatey you will see that echo is executed which is so bad!
REM so save this in reg:
REM all 32 characters: & % ' ( ) ~ + @ # $ { } [ ] ; , ` ! ^ | > < \ / " : ? * = . - _ & echo baaaad
REM and this:
REM (^.*)(Form Product=")([^"]*") FormType="[^"]*" FormID="([0-9][0-9]*)".*$
REM and use set to print those variables and see if they are saved without change ; refreshenv fail dramatically with those variables
REM invalid characters (illegal characters in file names) in Windows using NTFS
REM \ / : * ? " < > | and ^ in FAT
REM __________________________________________________________________________________________
REM __________________________________________________________________________________________
REM __________________________________________________________________________________________
REM this is a hybrid script which call vbs from cmd directly
REM :: The only restriction is the batch code cannot contain - - > (without space between - - > of course)
REM :: The only restriction is the VBS code cannot contain </script>.
REM :: The only risk is the undocumented use of "%~f0?.wsf" as the script to load. Somehow the parser properly finds and loads the running .BAT script "%~f0", and the ?.wsf suffix mysteriously instructs CSCRIPT to interpret the script as WSF. Hopefully MicroSoft will never disable that "feature".
REM :: https://stackoverflow.com/questions/9074476/is-it-possible-to-embed-and-execute-vbscript-within-a-batch-file-without-using-a
if "%debugme%"=="yes" (
echo RefrEnv - Refresh the Environment for CMD - ^(Debug enabled^)
) else (
echo RefrEnv - Refresh the Environment for CMD
)
set "TEMPDir=%TEMP%\refrenv"
IF NOT EXIST "%TEMPDir%" mkdir "%TEMPDir%"
set "outputfile=%TEMPDir%\_NewEnv.cmd"
REM detect if DelayedExpansion is enabled
REM It relies on the fact, that the last caret will be removed only in delayed mode.
REM https://www.dostips.com/forum/viewtopic.php?t=6496
set "DelayedExpansionState=IsDisabled"
IF "^!" == "^!^" (
REM echo DelayedExpansion is enabled
set "DelayedExpansionState=IsEnabled"
)
REM :: generate %outputfile% which contain all the new variables
REM cscript //nologo "%~f0?.wsf" %1
cscript //nologo "%~f0?.wsf" "%outputfile%" %DelayedExpansionState%
REM ::set the new variables generated with vbscript script above
REM for this to work always it is necessary to use DisableDelayedExpansion or escape ! and ^ when using EnableDelayedExpansion, but this script already solve this, so no worry about that now, thanks to God
REM test it with some bad var like:
REM all 32 characters: ; & % ' ( ) ~ + @ # $ { } [ ] , ` ! ^ | > < \ / " : ? * = . - _ & echo baaaad
REM For /f delims^=^ eol^= %%a in (%outputfile%) do %%a
REM for /f "delims== tokens=1,2" %%G in (%outputfile%) do set "%%G=%%H"
For /f delims^=^ eol^= %%a in (%outputfile%) do set %%a
REM for safely print a variable with bad charachters do:
REM SETLOCAL EnableDelayedExpansion
REM echo "!z9!"
REM or
REM set z9
REM but generally paths and environment variables should not have bad metacharacters, but it is not a rule!
if "%debugme%"=="yes" (
explorer "%TEMPDir%"
) else (
rmdir /Q /S "%TEMPDir%"
)
REM cleanup
set "TEMPDir="
set "outputfile="
set "DelayedExpansionState="
set "debugme="
REM pause
exit /b
REM #############################################################################
REM :: to run jscript you have to put <script language="JScript"> directly after ----- Begin wsf script --->
----- Begin wsf script --->
<job><script language="VBScript">
REM #############################################################################
REM ### put you code here #######################################################
REM #############################################################################
REM based on itsadok script from here
REM https://stackoverflow.com/questions/171588/is-there-a-command-to-refresh-environment-variables-from-the-command-prompt-in-w
REM and it is faster as stated by this comment
REM While I prefer the Chocolatey code-wise for being pure batch code, overall I decided to use this one, since it's faster. (~0.3 seconds instead of ~1 second -- which is nice, since I use it frequently in my Explorer "start cmd here" entry) –
REM and it is safer based on my tests, the Chocolatey refreshenv is so bad if the variable have some cmd metacharacters
Const ForReading = 1
Const ForWriting = 2
Const ForAppending = 8
Set WshShell = WScript.CreateObject("WScript.Shell")
filename=WScript.Arguments.Item(0)
DelayedExpansionState=WScript.Arguments.Item(1)
TMPfilename=filename & "_temp_.cmd"
Set fso = CreateObject("Scripting.fileSystemObject")
Set tmpF = fso.CreateTextFile(TMPfilename, TRUE)
set oEnvS=WshShell.Environment("System")
for each sitem in oEnvS
tmpF.WriteLine(sitem)
next
SystemPath = oEnvS("PATH")
set oEnvU=WshShell.Environment("User")
for each sitem in oEnvU
tmpF.WriteLine(sitem)
next
UserPath = oEnvU("PATH")
set oEnvV=WshShell.Environment("Volatile")
for each sitem in oEnvV
tmpF.WriteLine(sitem)
next
VolatilePath = oEnvV("PATH")
set oEnvP=WshShell.Environment("Process")
REM i will not save the process env but only its path, because it have strange variables like =::=::\ and =F:=.... which seems to be added by vbscript
REM for each sitem in oEnvP
REM tmpF.WriteLine(sitem)
REM next
REM here we add the actual session path, so we do not reset the original path, because maybe the parent script added some folders to the path, If we need to reset the path then comment the following line
ProcessPath = oEnvP("PATH")
REM merge System, User, Volatile, and process PATHs
NewPath = SystemPath & ";" & UserPath & ";" & VolatilePath & ";" & ProcessPath
REM ________________________________________________________________
REM :: remove duplicates from path
REM :: expand variables so they become like windows do when he read reg and create path, then Remove duplicates without sorting
REM why i will clean the path from duplicates? because:
REM the maximum string length in cmd is 8191 characters. But string length doesnt mean that you can save 8191 characters in a variable because also the assignment belongs to the string. you can save 8189 characters because the remaining 2 characters are needed for "a="
REM based on my tests:
REM when i open cmd as user , windows does not remove any duplicates from the path, and merge system+user+volatil path
REM when i open cmd as admin, windows do: system+user path (here windows do not remove duplicates which is stupid!) , then it adds volatil path after removing from it any duplicates
REM ' https://www.rosettacode.org/wiki/Remove_duplicate_elements#VBScript
Function remove_duplicates(list)
arr = Split(list,";")
Set dict = CreateObject("Scripting.Dictionary")
REM ' force dictionary compare to be case-insensitive , uncomment to force case-sensitive
dict.CompareMode = 1
For i = 0 To UBound(arr)
If dict.Exists(arr(i)) = False Then
dict.Add arr(i),""
End If
Next
For Each key In dict.Keys
tmp = tmp & key & ";"
Next
remove_duplicates = Left(tmp,Len(tmp)-1)
End Function
REM expand variables
NewPath = WshShell.ExpandEnvironmentStrings(NewPath)
REM remove duplicates
NewPath=remove_duplicates(NewPath)
REM remove_duplicates() will add a ; to the end so lets remove it if the last letter is ;
If Right(NewPath, 1) = ";" Then
NewPath = Left(NewPath, Len(NewPath) - 1)
End If
tmpF.WriteLine("PATH=" & NewPath)
tmpF.Close
REM ________________________________________________________________
REM :: exclude setting variables which may be dangerous to change
REM when i run a script from task scheduler using SYSTEM user the following variables are the differences between the scheduler env and a normal cmd script, so i will not override those variables
REM APPDATA=D:\Users\LLED2\AppData\Roaming
REM APPDATA=D:\Windows\system32\config\systemprofile\AppData\Roaming
REM LOCALAPPDATA=D:\Users\LLED2\AppData\Local
REM LOCALAPPDATA=D:\Windows\system32\config\systemprofile\AppData\Local
REM TEMP=D:\Users\LLED2\AppData\Local\Temp
REM TEMP=D:\Windows\TEMP
REM TMP=D:\Users\LLED2\AppData\Local\Temp
REM TMP=D:\Windows\TEMP
REM USERDOMAIN=LLED2-PC
REM USERDOMAIN=WORKGROUP
REM USERNAME=LLED2
REM USERNAME=LLED2-PC$
REM USERPROFILE=D:\Users\LLED2
REM USERPROFILE=D:\Windows\system32\config\systemprofile
REM i know this thanks to this comment
REM The solution is good but it modifies env variables TEMP and TMP replacing them with values stored in HKCU\Environment. In my case I run the script to update env variables modified by Jenkins job on a slave that's running under SYSTEM account, so TEMP and TMP get substituted by %USERPROFILE%\AppData\Local\Temp instead of C:\Windows\Temp. This breaks build because linker cannot open system profile's Temp folder. – Gene Mayevsky Sep 26 '19 at 20:51
REM Delete Lines of a Text File Beginning with a Specified String
REM those are the variables which should not be changed by this script
arrBlackList = Array("ALLUSERSPROFILE=", "APPDATA=", "CommonProgramFiles=", "CommonProgramFiles(x86)=", "CommonProgramW6432=", "COMPUTERNAME=", "ComSpec=", "HOMEDRIVE=", "HOMEPATH=", "LOCALAPPDATA=", "LOGONSERVER=", "NUMBER_OF_PROCESSORS=", "OS=", "PATHEXT=", "PROCESSOR_ARCHITECTURE=", "PROCESSOR_ARCHITEW6432=", "PROCESSOR_IDENTIFIER=", "PROCESSOR_LEVEL=", "PROCESSOR_REVISION=", "ProgramData=", "ProgramFiles=", "ProgramFiles(x86)=", "ProgramW6432=", "PUBLIC=", "SystemDrive=", "SystemRoot=", "TEMP=", "TMP=", "USERDOMAIN=", "USERDOMAIN_ROAMINGPROFILE=", "USERNAME=", "USERPROFILE=", "windir=", "SESSIONNAME=")
Set objFS = CreateObject("Scripting.FileSystemObject")
Set objTS = objFS.OpenTextFile(TMPfilename, ForReading)
strContents = objTS.ReadAll
objTS.Close
TMPfilename2= filename & "_temp2_.cmd"
arrLines = Split(strContents, vbNewLine)
Set objTS = objFS.OpenTextFile(TMPfilename2, ForWriting, True)
REM this is the equivalent of findstr /V /I /L or grep -i -v , i don t know a better way to do it, but it works fine
For Each strLine In arrLines
bypassThisLine=False
For Each BlackWord In arrBlackList
If Left(UCase(LTrim(strLine)),Len(BlackWord)) = UCase(BlackWord) Then
bypassThisLine=True
End If
Next
If bypassThisLine=False Then
objTS.WriteLine strLine
End If
Next
REM ____________________________________________________________
REM :: expand variables because registry save some variables as unexpanded %....%
REM :: and escape ! and ^ for cmd EnableDelayedExpansion mode
set f=fso.OpenTextFile(TMPfilename2,ForReading)
REM Write file: ForAppending = 8 ForReading = 1 ForWriting = 2 , True=create file if not exist
set fW=fso.OpenTextFile(filename,ForWriting,True)
Do Until f.AtEndOfStream
LineContent = f.ReadLine
REM expand variables
LineContent = WshShell.ExpandEnvironmentStrings(LineContent)
REM _____this part is so important_____
REM if cmd delayedexpansion is enabled in the parent script which calls this script then bad thing happen to variables saved in the registry if they contain ! . if var have ! then ! and ^ are removed; if var do not have ! then ^ is not removed . to understand what happens read this :
REM how cmd delayed expansion parse things
REM https://stackoverflow.com/questions/4094699/how-does-the-windows-command-interpreter-cmd-exe-parse-scripts/7970912#7970912
REM For each parsed token, first check if it contains any !. If not, then the token is not parsed - important for ^ characters. If the token does contain !, then scan each character from left to right:
REM - If it is a caret (^) the next character has no special meaning, the caret itself is removed
REM - If it is an exclamation mark, search for the next exclamation mark (carets are not observed anymore), expand to the value of the variable.
REM - Consecutive opening ! are collapsed into a single !
REM - Any remaining unpaired ! is removed
REM ...
REM Look at next string of characters, breaking before !, :, or <LF>, and call them VAR
REM conclusion:
REM when delayedexpansion is enabled and var have ! then i have to escape ^ and ! ,BUT IF VAR DO NOT HAVE ! THEN DO NOT ESCAPE ^ .this made me crazy to discover
REM when delayedexpansion is disabled then i do not have to escape anything
If DelayedExpansionState="IsEnabled" Then
If InStr(LineContent, "!") > 0 Then
LineContent=Replace(LineContent,"^","^^")
LineContent=Replace(LineContent,"!","^!")
End If
End If
REM __________
fW.WriteLine(LineContent)
Loop
f.Close
fW.Close
REM #############################################################################
REM ### end of vbscript code ####################################################
REM #############################################################################
REM this must be at the end for the hybrid trick, do not remove it
</script></job>
cygwin / bash:
我不能在这里发布，我达到了发布限制，所以从这里下载
在bash中使用:source refresh .sh调用它
美国小妞Powershell:
从这里下载
在Powershell中使用:. .\refrenv.ps1调用它
令人困惑的事情可能是，有几个地方可以启动cmd。 在我的情况下，我从windows资源管理器运行cmd，环境变量没有改变，而当从“运行”(windows键+ r)开始cmd时，环境变量被改变了。
在我的情况下，我只需要从任务管理器中杀死windows资源管理器进程，然后从任务管理器中重新启动它。
一旦我这样做了，我就可以从windows资源管理器衍生的cmd中访问新的环境变量。
根据设计，Windows没有内置机制来将环境变量添加/更改/删除传播到已经运行的cmd.exe中，无论是从另一个cmd.exe还是从“我的电脑->属性->高级设置->环境变量”。
如果在现有的开放命令提示符范围之外修改或添加新的环境变量，则需要重新启动命令提示符，或者在现有的命令提示符中使用SET手动添加。
最新接受的答案通过手动刷新脚本中的所有环境变量显示了部分解决方案。该脚本处理在“My Computer…”中全局更改环境变量的用例。但是如果一个环境变量在一个cmd.exe中被更改，脚本不会将其传播到另一个运行cmd.exe的环境变量中。
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