[jira] [Created] (MNG-6973) Document certain system properties in `mvn --help`

[Konrad Windszus (Jira)]

Konrad Windszus created MNG-6973:
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             Summary: Document certain system properties in `mvn --help`
                 Key: MNG-6973
                 URL: https://issues.apache.org/jira/browse/MNG-6973
             Project: Maven
          Issue Type: Improvement
          Components: Command Line
    Affects Versions: 3.6.3
            Reporter: Konrad Windszus


There are some system properties which can be used to influence behaviour of 
Maven which is not described via {{mvn --help}}:

# {{maven.repo.local}} 
(https://github.com/apache/maven/blame/5739b12aa9fc03bdd9eb6482b7a75f98a3c1ba6e/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L1603)
# {{style.colo}} 
https://github.com/apache/maven/blame/5739b12aa9fc03bdd9eb6482b7a75f98a3c1ba6e/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L503

I haven't found any documentation around those anywhere but I consider both 
useful enough to be documented with {{--help}}



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