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https://jira.codehaus.org/browse/MNG-5533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=334997#comment-334997
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Anders Hammar commented on MNG-5533:
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AFAIK, it was a deliberate choice not to change the name of the M2_HOME env
variable.
> M2 vs M3
> --------
>
> Key: MNG-5533
> URL: https://jira.codehaus.org/browse/MNG-5533
> Project: Maven 2 & 3
> Issue Type: Improvement
> Components: Class Loading, Command Line, Documentation: General,
> General
> Affects Versions: Issues to be reviewed for 3.x
> Environment: Windows
> Reporter: Martin Spamer
> Priority: Critical
>
> Maven 3 uses the M2 environment variable. Surely it would be more reasonable
> to update this to M3 to allow sensible migration. e.g
> M2=C:\Program Files\Apache Software Foundation\apache-maven-2.2.1\bin
> M2_HOME=C:\Program Files\Apache Software Foundation\apache-maven-2.2.1
> M3=C:\Program Files\Apache Software Foundation\apache-maven-3.1.1\bin
> M3_HOME=C:\Program Files\Apache Software Foundation\apache-maven-3.1.1
> MAVEN=%M2% or MAVEN=%M3%
> PATH=%MAVEN%;%PATH%
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