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gist: 24308 Download_button fork
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uninstall_merb.rb #
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desc "Uninstall all Merb gems for a fresh start"
task "merb:uninstall" do
  cmd = [
    "gem list",
    "grep merb",
    "cut -d ' ' -f 1",
    "xargs sudo gem uninstall --all"
    ].join(" | ")
  system(cmd)
end