What is :scm_verbose on capistrano?

I searched on capistrano documentation but I did开发者_运维知识库n't find.

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From the source (in this case subversion, but it works similarly for other scm modules):

def verbose
  variable(:scm_verbose) ? nil : "-q"
end

Unless :scm_verbose is true, the -q option is added to all svn commands, which suppresses output such as lists of files retrieved from the repository.