blocks|key|1006309|text|我个人从未发现设置M2_HOME很有用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1006310|重要的是您的$PATH环境。劫持丹尼克斯的部分答案，你所需要的就是：|1006311|export+PATH=/Users/xxx/sdk/apache-maven-3.0.5/bin:$PATH|code-block|syntax|javascript|1006312|无论如何，mvn脚本为您计算M2_HOME的值。|1006313|entityMap^0|9|7|0|0|0|5|3|E|7|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

I've personally never found it useful to set <code>M2_HOME</code>.

What counts is your $PATH environment. Hijacking part of the answer from Danix, all you need is:

<pre><code>export PATH=/Users/xxx/sdk/apache-maven-3.0.5/bin:$PATH
</code></pre>

The <code>mvn</code> script computes <code>M2_HOME</code> for you anyway for what it's worth.

blocks|key|1006389|text|在Maven+3.5.0中不使用M2_HOME+(和类似的内容)。详细信息请参见MNG-5607和发行说明。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1006390|entityMap|0|LINK|mutability|MUTABLE|url|https://issues.apache.org/jira/browse/MNG-5607|1|https://maven.apache.org/docs/3.5.0/release-notes.html^0|G|7|14|8|0|1D|4|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]|$9|V|A|W|1|X]]|E|$]]|$1|F|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

<code>M2_HOME</code> (and the like) is not to be used as of Maven 3.5.0. See <a href="https://issues.apache.org/jira/browse/MNG-5607" rel="noreferrer">MNG-5607</a> and <a href="https://maven.apache.org/docs/3.5.0/release-notes.html" rel="noreferrer">Release Notes</a> for details.

blocks|key|1006275|text|这是我的Maven设置。你可以用它作为一个例子。为了使用Maven，您不需要其他任何东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1006276|M2_HOME用于Maven+2和3|1006277|export+M2_HOME=/Users/xxx/sdk/apache-maven-3.0.5
export+M2=$M2_HOME/bin
export+MAVEN_OPTS="-Xmx1048m+-Xms256m+-XX:MaxPermSize=312M"
export+PATH=$M2:$PATH|code-block|syntax|javascript|1006278|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here is my Maven setup. You can use it as an example. You don't need anything else in order to use Maven.

M2_HOME is used for both Maven 2 and 3

<pre><code>export M2_HOME=/Users/xxx/sdk/apache-maven-3.0.5
export M2=$M2_HOME/bin
export MAVEN_OPTS="-Xmx1048m -Xms256m -XX:MaxPermSize=312M"
export PATH=$M2:$PATH
</code></pre>

blocks|key|2242095|text|MAVEN_HOME用于maven+1，M2_HOME+用于定位maven+2。拥有两个不同的_HOME变量意味着可以在同一台机器上同时运行这两个变量。如果你检查一下旧的mvn.cmd脚本，|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2242096|@REM+----------------------------------------------------------------------------
@REM+Maven2+Start+Up+Batch+script
@REM
@REM+Required+ENV+vars:
@REM+JAVA_HOME+-+location+of+a+JDK+home+dir
@REM
@REM+Optional+ENV+vars
@REM+M2_HOME+-+location+of+maven2's+installed+home+dir
@REM+MAVEN_BATCH_ECHO+-+set+to+'on'+to+enable+the+echoing+of+the+batch+commands
@REM+MAVEN_BATCH_PAUSE+-+set+to+'on'+to+wait+for+a+key+stroke+before+ending
@REM+MAVEN_OPTS+-+parameters+passed+to+the+Java+VM+when+running+Maven
@REM+++++e.g.+to+debug+Maven+itself,+use
@REM+set+MAVEN_OPTS=-Xdebug+-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
@REM+MAVEN_SKIP_RC+-+flag+to+disable+loading+of+mavenrc+files
@REM+----------------------------------------------------------------------------|code-block|syntax|javascript|2242097|看到@REM+M2_HOME+-+location+of+maven2's+installed+home+dir|CODE|2242098|无论如何，按照文档，maven+3.5不再推荐使用这种模式。|2242099|基于与安装的不同M2_HOME版本相关的使用M2_HOME的问题，为了简化操作，已经删除了M2_HOME的使用，不再支持MNG-5823、MNG-5836、MNG-5607|blockquote|2242100|所以现在mvn.cmd看起来，|2242101|@REM+-----------------------------------------------------------------------------
@REM+Apache+Maven+Startup+Script
@REM
@REM+Environment+Variable+Prerequisites
@REM
@REM+++JAVA_HOME++++++++++Must+point+at+your+Java+Development+Kit+installation.
@REM+++MAVEN_BATCH_ECHO++(Optional)+Set+to+'on'+to+enable+the+echoing+of+the+batch+commands.
@REM+++MAVEN_BATCH_PAUSE+(Optional)+set+to+'on'+to+wait+for+a+key+stroke+before+ending.
@REM+++MAVEN_OPTS++++++++(Optional)+Java+runtime+options+used+when+Maven+is+executed.
@REM+++MAVEN_SKIP_RC+++++(Optional)+Flag+to+disable+loading+of+mavenrc+files.
@REM+-----------------------------------------------------------------------------|2242102|因此，您需要的是正确设置JAVA_HOME。按照新的安装指南(截至2017年9月12日)，只需将maven+bin目录路径添加到path变量。它应该能起作用。|2242103|例：export+PATH=/opt/apache-maven-3.5.2/bin:$PATH|2242104|entityMap|0|LINK|mutability|MUTABLE|url|https://maven.apache.org/docs/3.5.0/release-notes.html|1|https://issues.apache.org/jira/browse/MNG-5823|2|https://issues.apache.org/jira/browse/MNG-5836|3|https://issues.apache.org/jira/browse/MNG-5607|4|http://%2520https://maven.apache.org/install.html^0|0|J|K|7|S|B|2D|7|0|0|2|1I|0|7|2|0|0|1O|8|1|1X|8|2|26|8|3|0|0|0|O|K|4|0|2|19|0^^$0|@$1|2|3|4|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1P|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1Q|8|@$9|1R|A|1S|B|M]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1T|8|@]|D|@$9|1U|A|1V|1|1W]]|E|$]]|$1|P|3|Q|5|R|7|1X|8|@]|D|@$9|1Y|A|1Z|1|20]|$9|21|A|22|1|23]|$9|24|A|25|1|26]]|E|$]]|$1|S|3|T|5|6|7|27|8|@]|D|@]|E|$]]|$1|U|3|V|5|H|7|28|8|@]|D|@]|E|$I|J]]|$1|W|3|X|5|6|7|29|8|@]|D|@$9|2A|A|2B|1|2C]]|E|$]]|$1|Y|3|Z|5|6|7|2D|8|@$9|2E|A|2F|B|M]]|D|@]|E|$]]|$1|10|3|-4|5|6|7|2G|8|@]|D|@]|E|$]]]|11|$12|$5|13|14|15|E|$16|17]]|18|$5|13|14|15|E|$16|19]]|1A|$5|13|14|15|E|$16|1B]]|1C|$5|13|14|15|E|$16|1D]]|1E|$5|13|14|15|E|$16|1F]]]]

MAVEN_HOME is used for maven 1 and M2_HOME is used to locate maven 2. Having the two different _HOME variables means it is possible to run both on the same machine.
And if you check old mvn.cmd scripts they have something like,
<pre><code>@REM ----------------------------------------------------------------------------
@REM Maven2 Start Up Batch script
@REM
@REM Required ENV vars:
@REM JAVA_HOME - location of a JDK home dir
@REM
@REM Optional ENV vars
@REM M2_HOME - location of maven2's installed home dir
@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a key stroke before ending
@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
@REM e.g. to debug Maven itself, use
@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
@REM ----------------------------------------------------------------------------
</code></pre>
See that <code>@REM M2_HOME - location of maven2's installed home dir</code>
Anyway usage of this pattern is now deprecated with maven 3.5 as per the <a href="https://maven.apache.org/docs/3.5.0/release-notes.html" rel="noreferrer">documentation</a>.
<blockquote>
Based on problems in using M2_HOME related to different Maven versions installed and to simplify things, the usage of M2_HOME has been removed and is not supported any more <a href="https://issues.apache.org/jira/browse/MNG-5823" rel="noreferrer">MNG-5823</a>, <a href="https://issues.apache.org/jira/browse/MNG-5836" rel="noreferrer">MNG-5836</a>, <a href="https://issues.apache.org/jira/browse/MNG-5607" rel="noreferrer">MNG-5607</a>
</blockquote>
So now the mvn.cmd look like,
<pre><code>@REM -----------------------------------------------------------------------------
@REM Apache Maven Startup Script
@REM
@REM Environment Variable Prerequisites
@REM
@REM JAVA_HOME Must point at your Java Development Kit installation.
@REM MAVEN_BATCH_ECHO (Optional) Set to 'on' to enable the echoing of the batch commands.
@REM MAVEN_BATCH_PAUSE (Optional) set to 'on' to wait for a key stroke before ending.
@REM MAVEN_OPTS (Optional) Java runtime options used when Maven is executed.
@REM MAVEN_SKIP_RC (Optional) Flag to disable loading of mavenrc files.
@REM -----------------------------------------------------------------------------
</code></pre>
So what you need is JAVA_HOME to be set correctly. As per the <a href="http://%20https://maven.apache.org/install.html" rel="noreferrer">new installation guide (as of 12/29/2017)</a>,
Just add the maven bin directory path to the PATH variable. It should do the trick.
ex : <code>export PATH=/opt/apache-maven-3.5.2/bin:$PATH</code>

blocks|key|957612|text|在Windows上，当前定位settings.xml的方法是转到%25USERPROFILE%25。在这里，包含一个目录.m2，在那里人们可以找到settings.xml。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|957613|M2_HOME**.+从不使用它不受支持，因为Apache+3.5.0:**|BOLD|957614|基于与安装的不同M2_HOME版本相关的使用M2_HOME的问题，为了简化操作，M2_HOME的使用已经被删除，不再支持任何MNG-5823、MNG-5836、MNG-5607。
对windows用户的重要更改：%25HOME%25的使用已被%25USERPROFILE%25+MNG-6001所取代
来源：https://maven.apache.org/docs/3.5.0/release-notes.html#overview-about-the-changes|blockquote|957615|注意:在巧克力味的Apache包集M2_HOME时，我无意中回答了这个问题--我想定位settings.xml。|957616|entityMap|0|LINK|mutability|MUTABLE|url|https://issues.apache.org/jira/browse/MNG-5823|1|https://issues.apache.org/jira/browse/MNG-5836|2|https://issues.apache.org/jira/browse/MNG-5607|3|https://issues.apache.org/jira/browse/MNG-6001|4|https://maven.apache.org/docs/3.5.0/release-notes.html#overview-about-the-changes|5|https://stackoverflow.com/tags/chocolatey/info^0|E|C|W|D|1K|3|1X|C|0|0|9|B|4|0|7|0|8|7|M|7|14|7|2Y|6|39|D|1Q|8|0|1Z|8|1|28|8|2|3N|8|3|42|29|4|0|H|7|17|C|4|4|5|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1E|8|@$9|1F|A|1G|B|H]|$9|1H|A|1I|B|H]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|I|3|J|5|K|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]|$9|1Q|A|1R|B|C]|$9|1S|A|1T|B|C]|$9|1U|A|1V|B|C]]|D|@$9|1W|A|1X|1|1Y]|$9|1Z|A|20|1|21]|$9|22|A|23|1|24]|$9|25|A|26|1|27]|$9|28|A|29|1|2A]]|E|$]]|$1|L|3|M|5|6|7|2B|8|@$9|2C|A|2D|B|C]|$9|2E|A|2F|B|C]]|D|@$9|2G|A|2H|1|2I]]|E|$]]|$1|N|3|-4|5|6|7|2J|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]|V|$5|Q|R|S|E|$T|W]]|X|$5|Q|R|S|E|$T|Y]]|Z|$5|Q|R|S|E|$T|10]]|11|$5|Q|R|S|E|$T|12]]|13|$5|Q|R|S|E|$T|14]]]]

On Windows, the current way to locate <code>settings.xml</code> is to go to <code>%USERPROFILE%</code>. There, a directory <code>.m2</code> is contained, where one finds <code>settings.xml</code>.
Never use <code>M2_HOME</code>. It is unsupported since Apache Maven 3.5.0:
<blockquote>
Based on problems in using <code>M2_HOME</code> related to different Maven versions installed and to simplify things, the usage of <code>M2_HOME</code> has been removed and is not supported any more <a href="https://issues.apache.org/jira/browse/MNG-5823" rel="nofollow noreferrer">MNG-5823</a>, <a href="https://issues.apache.org/jira/browse/MNG-5836" rel="nofollow noreferrer">MNG-5836</a>, <a href="https://issues.apache.org/jira/browse/MNG-5607" rel="nofollow noreferrer">MNG-5607</a>.
Important change for windows users: The usage of <code>%HOME%</code> has been replaced with <code>%USERPROFILE%</code> <a href="https://issues.apache.org/jira/browse/MNG-6001" rel="nofollow noreferrer">MNG-6001</a>
Source: <a href="https://maven.apache.org/docs/3.5.0/release-notes.html#overview-about-the-changes" rel="nofollow noreferrer">https://maven.apache.org/docs/3.5.0/release-notes.html#overview-about-the-changes</a>
</blockquote>
Note: I stumbled over the question as <a href="https://stackoverflow.com/tags/chocolatey/info">chocolatey</a>'s Apache Maven package sets <code>M2_HOME</code> - and I wanted to locate <code>settings.xml</code>.

blocks|key|2241852|text|例如，有时使用$M2_HOME来安装Takari+Extensions+for+Apache+Maven|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2241853|查找$M2_HOME值的一种方法是搜索mvn|2241854|sudo+find+/+-name+"mvn"+2>/dev/null|code-block|syntax|javascript|2241855|而且，很可能是：/opt/maven/|2241856|entityMap|0|LINK|mutability|MUTABLE|url|http://takari.io/book/30-team-maven.html^0|7|8|I|Y|I|Y|0|0|2|8|J|3|0|0|8|B|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

<code>$M2_HOME</code>is used sometimes, for example, to install <a href="http://takari.io/book/30-team-maven.html" rel="nofollow"><code>Takari Extensions for Apache Maven</code></a>

One way to find <code>$M2_HOME</code> value is to search for <code>mvn</code>:

<pre><code>sudo find / -name "mvn" 2&gt;/dev/null
</code></pre>

And, probably it will be: <code>/opt/maven/</code>

blocks|key|957589|text|我已经用以下方法解决了同样的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|957590|export+M2_HOME=/usr/share/maven|code-block|syntax|javascript|957591|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have solved same issue with following:

<pre><code>export M2_HOME=/usr/share/maven
</code></pre>

blocks|key|2241896|text|我们有M2_HOME，MAVEN_HOME，M3_HOME都可以在市场上买到|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2241897|以前，M2_HOME是所有作为标准使用的唯一环境变量。|2241898|但是，在最新的版本中，MAVEN_Home作为标准版本出现了，但是一些旧的工具仍然试图只找到M2_HOME。|2241899|因此，我们应该使用新的和旧的工具来支持M2_HOME和MAVEN_HOME。|2241900|M2_HOME也可以用于这两个方面。|2241901|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

We have M2_HOME,MAVEN_HOME,M3_HOME all are available in market 
Previously M2_HOME is the only environment variable used by all as a standard. 
But,due latest releases the MAVEN_Home came as standard but some old tools are still trying to find only M2_HOME 
so we should have both M2_HOME,MAVEN_HOME to sustain with old and new tools. M2_HOME can be used for both as well

What's the correct Maven environment variable name: <code>MAVEN_HOME</code>, <code>MVN_HOME</code> or <code>M2_HOME</code>? 

I've found some details about <code>MAVEN_HOME</code> and <code>M2_HOME</code> <a href="https://stackoverflow.com/questions/17136324/what-is-the-difference-between-m2-home-and-maven-home">here</a>. But I also have seen <code>MVN_HOME</code> around.

MAVEN_HOME, MVN_HOME or M2_HOME

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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正确的Maven环境变量名是什么：MAVEN_HOME、MVN_HOME或M2_HOME？我找到了一些关于MAVEN_HOME和M2_HOME 的细节。但我也见过MVN_HOME。

问MAVEN_HOME、MVN_HOME或M2_HOME
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