janis-air:myApp janijegoroff$ DEBUG=1 DEVICE_TARGET='iPad Retina (8.0 Simulator)' calabash-ios console
Running irb...
irb(main):001:0> start_test_server_in_background

INFO: Using uia strategy: 'preferences'
Sending 'QUIT' to instruments process '78036'
Waiting for instruments '78036' to terminate
Preparation took 3.135206 seconds
{
                        :app => "/Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app",
                       :args => [],
    :bundle_dir_or_bundle_id => "/Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app",
                  :bundle_id => "my-bundle-id",
                     :device => "iphone",
              :device_target => "iPad Retina (8.0 Simulator)",
              :launch_method => :instruments,
             :launch_retries => 5,
                   :log_file => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out",
                  :no_launch => false,
                    :no_stop => false,
                      :reset => false,
                :results_dir => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc",
          :results_dir_trace => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/trace",
                     :script => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/_run_loop.js",
                :sdk_version => nil,
                       :udid => "iPad Retina (8.0 Simulator)",
               :uia_strategy => :preferences,
                      :xcode => "6.0.1",
                 :xcode_path => "/Applications/Xcode601/Xcode.app/Contents/Developer"
}

### Starting on iPad Retina (8.0 Simulator) App: /Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app ###
2014-10-14 11:18:45 +0100 xcrun instruments -w "iPad Retina (8.0 Simulator)" -D "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/trace" -t "Automation" "/Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app" -e UIARESULTSPATH /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc -e UIASCRIPT /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/_run_loop.js  &> /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out
Launching took 7.274896 seconds
Calabash::Cucumber::Launcher: Launch Method instruments
Log file: /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out
irb(main):002:0> uia('uia.alert().defaultButton().tap()')
{
       "status" => "error",
        "value" => "VerboseError: Cannot perform action on invalid element: UIAElementNil from target.frontMostApp().alert().defaultButton()",
    "backtrace" => "tap@[native code]\neval code\neval@[native code]\nglobal code@file:///Users/janijegoroff/myApp/66BB437F-FB56-467A-9C62-34F50B6747FC/_run_loop.js:23632:27",
        "index" => 0
}
irb(main):003:0>

janis-air:myApp janijegoroff$ cat /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out
Waiting for device to boot...
2014-10-14 10:18:52 +0000 Default: OUTPUT_JSON:
{"status":"success","value":true,"index":0}
END_OUTPUT
2014-10-14 10:18:52 +0000 Default: **************
2014-10-14 10:19:12 +0000 Default: OUTPUT_JSON:
{"output":{"output":"on alert"},"last_index":0}
END_OUTPUT
2014-10-14 10:19:12 +0000 Default: **************
2014-10-14 10:19:23 +0000 Default: OUTPUT_JSON:
{"output":{"output":"alert: null"},"last_index":0}
END_OUTPUT
2014-10-14 10:19:23 +0000 Default: **************
2014-10-14 10:19:27 +0000 Default: index 0 is command: uia.alert().defaultButton().tap()
2014-10-14 10:19:27 +0000 Debug: Cannot perform action on invalid element: UIAElementNil from target.frontMostApp().alert().defaultButton()
2014-10-14 10:19:27 +0000 Default: OUTPUT_JSON:
{"output":{"output":"Failure: VerboseError: Cannot perform action on invalid element: UIAElementNil from target.frontMostApp().alert().defaultButton()  tap@[native code]\neval code\neval@[native code]\nglobal code@file:///Users/janijegoroff/myApp/66BB437F-FB56-467A-9C62-34F50B6747FC/_run_loop.js:23632:27"},"last_index":0}
END_OUTPUT
2014-10-14 10:19:27 +0000 Default: **************
2014-10-14 10:19:27 +0000 Default: Write result...
2014-10-14 10:19:27 +0000 Default: Check successful storage...
2014-10-14 10:19:27 +0000 Default: Storage succeeded: 0
janis-air:myApp janijegoroff$