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https://jira.codehaus.org/browse/MNG-5178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=289008#comment-289008
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SebbASF commented on MNG-5178:
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If this is done, it may break scripts etc that rely on M2_HOME variable.
So any such change should be well publicised as an incompatible change.
If it can be done in such a way that M2_HOME still works when using Maven 3, so
much the better.
> Substitute environment variable M2_HOME by M3_HOME
> --------------------------------------------------
>
> Key: MNG-5178
> URL: https://jira.codehaus.org/browse/MNG-5178
> Project: Maven 2 & 3
> Issue Type: Wish
> Components: Command Line
> Reporter: Oliver B. Fischer
> Priority: Minor
>
> Maven 3 uses the environment variable {{M2_HOME}} to point to it's
> installation directory. This variable should be replaced by {{M3_HOME}} to
> allow users to have parallel installations of Maven 2 and Maven 3 without any
> special handling of the environment variable {{M2_HOME}}.
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