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It would be good to mention that even project can be opened using CLI (--open $PATH_TO_PROJECT_FOLDER) since 6.0. Currently is mentioned only opening of file: Additional Module(s) Option(s): --open file1[:line1]... Opens specified file(s), possibly at given location
Already fixed in http://hg.netbeans.org/core-main/rev/5f2c06d6d7ec