How to get the output of Capistrano executed command

Sometimes it is required to get the the output of some executed command in external/deployment server and based on that output you may need to take some decision. Lets say for some reason you are planning for hot deployment to a JBoss application server. So before deployment you want to make sure if the JBoss is running or not. You can do that by following script. Here I am assuming that the JBoss is running at 8080

task :do_something_if_jboss_is_running do
  set :use_sudo, true
  set :user, prompt("User to check jboss running status: ")
  set :is_jboss_running, true

  run "netstat -an | grep -i listen | grep 8080|wc -l" do |ch, stream, data|
    if data.to_i > 0
      set :is_jboss_running, true
    else
      set :is_jboss_running, false
    end
  end
  
  if is_jboss_running 
#do something 
  else
#do some other thing
  end
end