blocks|key|1365085|text|注册表在启动时读取。当程序启动时，它会得到它的父环境的副本，通常是Explorer.exe.+When的环境。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365086|如注释所述，资源管理器(或任何其他对消息起作用的图形程序)如果收到来自其他程序(如setx)的消息，警告它注册表已更改，则重新读取注册表。|1365087|答案很简单|1365088|在顺序行上使用set和setx。|offset|length|style|CODE|1365089|entityMap^0|0|0|0|7|3|B|4|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@$H|R|I|S|J|K]|$H|T|I|U|J|K]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

The registry is read at boot. When a program is started it gets a copy of it's parent's environment, usually Explorer.exe's environment.

As the comment says, explorer (or any other graphical program that acts on the message) if it gets a message from some other program (like setx) warning it that the registry has been changed, rereads the registry.

The answer is simple

Use <code>set</code> and <code>setx</code> on sequential lines.

blocks|key|2663984|text|可以使用setx删除环境变量，这将广播正确的消息：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2663985|setx+TestVar+""
reg+delete+HKCU\Environment+/F+/V+TestVar|code-block|syntax|javascript|2663986|(正如注释中所讨论的，使用setx本身将在注册表中留下一个空条目，为了一致性起见，应该删除该条目。)|2663987|entityMap^0|4|4|0|0|D|4|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You can use <code>setx</code> to delete an environment variable, this will broadcast the correct message:

<pre><code>setx TestVar ""
reg delete HKCU\Environment /F /V TestVar
</code></pre>

(As discussed in the comments, using <code>setx</code> by itself will leave an empty entry behind in the registry, which should be deleted for the sake of consistency.)

blocks|key|1365151|text|这是解决我的问题的办法。我不知道这是否是正确的解决办法，但它对我有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365152|检查variable.cmd|offset|length|style|BOLD|1365153|set+TestVar
@pause|code-block|syntax|javascript|1365154|集variable.cmd|1365155|setx+TestVar+123
@pause|1365156|删除variable.cmd|1365157|reg+delete+HKCU\Environment+/F+/V+TestVar
setx+DummyVarUsedToDelete+""
reg+delete+HKCU\Environment+/F+/V+DummyVarUsedToDelete
@pause|1365158|setx不能用于删除变量(如解释的这里+)，但它会在使用reg+delete从注册表中删除变量后执行丢失的广播。|CODE|1365159|编辑|1365160|我添加了一行从注册表中删除DummyVarUsedToDelete。这将不会被广播，但这是一个小的临时问题。|1365161|entityMap|0|LINK|mutability|MUTABLE|url|https://technet.microsoft.com/en-us/library/cc755104.aspx^0|0|0|E|0|0|0|D|0|0|0|E|0|0|0|4|S|A|H|2|0|0|0|2|0|D|K|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1A|8|@$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1D|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1E|8|@$D|1F|E|1G|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|1H|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1I|8|@$D|1J|E|1K|F|G]]|9|@]|A|$]]|$1|S|3|T|5|J|7|1L|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|1M|8|@$D|1N|E|1O|F|W]|$D|1P|E|1Q|F|W]]|9|@$D|1R|E|1S|1|1T]]|A|$]]|$1|X|3|Y|5|6|7|1U|8|@$D|1V|E|1W|F|G]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1X|8|@$D|1Y|E|1Z|F|W]]|9|@]|A|$]]|$1|11|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|12|$13|$5|14|15|16|A|$17|18]]]]

Here is the solution to my problem. I don't know if it is the correct solution, but it works for me:

Check variable.cmd

<pre><code>set TestVar
@pause
</code></pre>

Set variable.cmd

<pre><code>setx TestVar 123
@pause
</code></pre>

Delete variable.cmd

<pre><code>reg delete HKCU\Environment /F /V TestVar
setx DummyVarUsedToDelete ""
reg delete HKCU\Environment /F /V DummyVarUsedToDelete
@pause
</code></pre>

<code>setx</code> cannot be used to delete a variable, as explained <a href="https://technet.microsoft.com/en-us/library/cc755104.aspx" rel="noreferrer">here</a>, but it does the missing broadcasting after a variable has been removed from the registry with <code>reg delete</code>.

EDIT

I added a line to delete the <code>DummyVarUsedToDelete</code> from the registry. This will not be broadcasted, but it is a small temporary problem.

blocks|key|1365181|text|删除系统路径变量|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365182|方法1：|1365183|set+var+=+C:\Users\mahidhai\cygwin64\usr\local\bin
REG+delete+"HKLM\SYSTEM\CurrentControlSet\Control\Session+Manager\Environment"+/F+/V+var|code-block|syntax|javascript|1365184|在我的例子中，即使我作为管理员运行，它也不起作用。命令提示符显示错误注册表项未找到|1365185|在这种情况下，直接转到注册表项文件。|1365186|Method2：|1365187|Go+To+register+editor+.
Run+->+regedit
NAvigate+to+
HKLM\SYSTEM\CurrentControlSet\Control\Session+Manager\Environment|1365188|通过单击寄存器键名，直接编辑注册键。|1365189|这应该很好|1365190|方法3：|1365191|Sometimes+not+updated+windows+could+be+the+issue+.+Check+if+any+updates++available+.+If+so+update+immediately|1365192|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

DELETING SYSTEM PATH VARIABLE

Method 1:

<pre><code>set var = C:\Users\mahidhai\cygwin64\usr\local\bin
REG delete "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /F /V var
</code></pre>

In my case , it didn't work even though i ran as administrator .
Command prompt displays error registry key not found 

In such case go directly to registry keys file 

Method2:

<pre><code>Go To register editor .
Run -&gt; regedit
NAvigate to 
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
</code></pre>

Edit directly the register key, by clicking on the register key name .

This should work fine

Method 3:

<pre><code>Sometimes not updated windows could be the issue . Check if any updates available . If so update immediately
</code></pre>

Why deleting an environment variable with <code>reg delete HKCU\Environment /F /V TestVar</code> in Windows 7 Professional removes it from the registry, but the variable still exists?

Here are the details: I created the following 3 <code>.cmd</code> files:

Check variable.cmd

<pre><code>echo TestVar = %TestVar%
pause
</code></pre>

Set variable.cmd

<pre><code>setx TestVar 123
pause
</code></pre>

Delete variable.cmd

<pre><code>reg delete HKCU\Environment /F /V TestVar
pause
</code></pre>

Then I follow these steps (double clicking to make sure that I start a new session every time):

<ol>
<li>Double click on <code>Check variable.cmd</code> and I see that <code>TestVar</code> does not exist</li>
<li>Double click on <code>Set variable.cmd</code> and it says <code>SUCCESS: Specified value was saved.</code></li>
<li>Double click on <code>Check variable.cmd</code> and it shows the variable value. Good!</li>
<li>Double click on <code>Delete variable.cmd</code> and it says <code>The operation completed successfully.</code></li>
<li>Double click on <code>Check variable.cmd</code> and it still shows the variable value. Bad!</li>
<li>Click on the Start menu, type <code>environment</code>, click on <code>Edit environment variables for your account</code> to open the <code>Environment Variables</code> dialog box, click <code>OK</code> without changing anything</li>
<li>Double click on <code>Check variable.cmd</code> and the variable does not exist anymore</li>
</ol>

I can find the value in the registry after step 2, I cannot find it after step 4, but step 5 still finds it. And even if I don't change anything, step 6 really deletes the variable.

Deleting environment variables doesn't work

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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为什么在Windows7Professional中删除带有reg delete HKCU\Environment /F /V TestVar的环境变量从注册表中删除，但该变量仍然存在？下面是详细信息:我创建了以下3个.cmd文件：检查variable.cmdecho TestVar = %TestVar%pause集v...

问删除环境变量无效
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