run "bash < <(curl -L http://bit.ly/rvm-install-system-wide)"

如：

task :install_rvm,:roles => :server do
  apps = %w(bison openssl libreadline6 libreadline6-dev zlib1g zlib1g-dev libssl-dev     libyaml-dev sqlite3 libsqlite3-0 libxml2-dev libxslt-dev autoconf subversion libcurl4-openssl-dev)
  apt.install( {:base => apps},:stable )
  run "bash < <(curl -L http://bit.ly/rvm-install-system-wide)"
  run "rvm install 1.9.2".sh
  run "rvm use 1.9.2@global"
  run "gem install awesome_print map_by_method wirble bundler builder pg cheat"
  run "gem install -v2.1.2 builder"
  # modify .bashrc
end

但是，由于Capistrano正在执行，我似乎无法让它上​​班：

"sh -c 'bash < <(curl -L http://bit.ly/rvm-install-system-wide)'" on ubuntu@ec2...

我在Capistrano gem中看到command.rb文件有一些代码

shell = "#{options[:shell] || "sh"} -c"

但是我不清楚如何将选项[：shell]传递给任务