I can't do it because I'm not using any script, I try to launch Appium.app (GUI). There is drop-down list, where all my simulators are listed. All these simulators have ids. I deleted this id from selected simulator and uncheck "UDID". Effect is:
Launching Appium with command: '/Applications/Appium 2.app/Contents/Resources/node/bin/node' lib/server/main.js --command-timeout "7200" --platform-version "7.0" --platform-name "iOS" --app "myApplication" --show-ios-log --device-name "iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500)"
info: Welcome to Appium v1.3.6 (REV 004f52f249d3513809e7d0734d9205d1fec19f8e)
info: Appium REST http interface listener started on 0.0.0.0:4723
info: [debug] Non-default server args: {"app":"myApplication","deviceName":"iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500)","platformName":"iOS","platformVersion":"7.0","showIOSLog":true,"defaultCommandTimeout":7200}
info: Console LogLevel: debug
info: --> GET /wd/hub/status {}
info: [debug] Responding to client with success: {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}
info: <-- GET /wd/hub/status 200 8.247 ms - 104 {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}
info: --> GET /wd/hub/status {}
info: [debug] Responding to client with success: {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}
info: <-- GET /wd/hub/status 200 3.258 ms - 104 {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}
info: --> GET /wd/hub/sessions {}
info: [debug] Responding to client with success: {"status":0,"value":[]}
info: <-- GET /wd/hub/sessions 200 0.988 ms - 23 {"status":0,"value":[]}
info: --> POST /wd/hub/session {"desiredCapabilities":{"platformName":"iOS","platformVersion":"7.0","newCommandTimeout":"999999","automationName":"Appium","deviceName":"iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500)"}}
info: Client User-Agent string: Appium (unknown version) CFNetwork/673.4 Darwin/13.3.0 (x86_64) (MacBookPro8%2C2)
info: [debug] App is an iOS bundle, will attempt to run as pre-existing
info: [debug] Creating new appium session 1ae3f2b9-522a-4cf6-b3df-21e4a475d9c7
info: [debug] Removing any remaining instruments sockets
info: [debug] Cleaned up instruments socket /tmp/instruments_sock
info: [debug] Setting Xcode folder
info: [debug] Setting Xcode version
info: [debug] Setting iOS SDK Version
info: [debug] Getting sdk version from xcrun with a timeout
info: [debug] iOS SDK Version set to 8.0
info: [debug] Checking whether instruments supports our device string
info: [debug] Getting list of devices instruments supports
info: [debug] Instruments is at: /Applications/Xcode 6.0.app/Contents/Developer/usr/bin/instruments
info: [debug] Getting device string from opts: {"forceIphone":false,"forceIpad":false,"xcodeVersion":"6.0","iOSSDKVersion":"8.0","deviceName":"iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500)","platformVersion":"7.0"}
info: [debug] fixDevice is on
info: [debug] Final device string is: 'iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500) (7.0 Simulator)'
info: [debug] Cleaning up appium session
info: [debug] Error: Could not find a device to launch. You requested 'iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500) (7.0 Simulator)', but the available devices were: ["iPad 2 (8.0 Simulator) [943A7599-5AC3-4A47-89FE-6A2B1D971DE2]","iPad Air (8.0 Simulator) [74ADF11C-30D1-4788-BB08-B6B96CFB3792]","iPad Retina (8.0 Simulator) [5D89C54B-FD2C-4FDF-9097-231117041708]","iPhone 4s (8.0 Simulator) [2F88059E-0FB2-47A3-A63C-2BCC47742B06]","iPhone 5 (8.0 Simulator) [4D83AB08-625F-4E53-A34E-051D1CDEF727]","iPhone 5s (8.0 Simulator) [545A4765-F808-42BE-A416-9A057781942E]","iPhone 6 (8.0 Simulator) [BF0CF896-400A-4CF8-8501-C4EC41D451BA]","iPhone 6 Plus (8.0 Simulator) [3646BEC6-C424-4DBE-BDB3-341AD9730B76]"]
at noDevicesError (/Applications/Appium 2.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios.js:1106:10)
at null. (/Applications/Appium 2.app/Contents/Resources/node_modules/appium/lib/devices/ios/ios.js:1112:16)
at /Applications/Appium 2.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:525:46
at /Applications/Appium 2.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:254:17
at /Applications/Appium 2.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:151:21
at /Applications/Appium 2.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:251:21
at /Applications/Appium 2.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:615:34
at /Applications/Appium 2.app/Contents/Resources/node_modules/appium/node_modules/async/lib/async.js:516:25
at /Applications/Appium 2.app/Contents/Resources/node_modules/appium/node_modules/appium-instruments/lib/instruments.js:111:7
at ChildProcess.exithandler (child_process.js:735:7)
error: Could not find a device to launch. You requested 'iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500) (7.0 Simulator)', but the available devices were: ["iPad 2 (8.0 Simulator) [943A7599-5AC3-4A47-89FE-6A2B1D971DE2]","iPad Air (8.0 Simulator) [74ADF11C-30D1-4788-BB08-B6B96CFB3792]","iPad Retina (8.0 Simulator) [5D89C54B-FD2C-4FDF-9097-231117041708]","iPhone 4s (8.0 Simulator) [2F88059E-0FB2-47A3-A63C-2BCC47742B06]","iPhone 5 (8.0 Simulator) [4D83AB08-625F-4E53-A34E-051D1CDEF727]","iPhone 5s (8.0 Simulator) [545A4765-F808-42BE-A416-9A057781942E]","iPhone 6 (8.0 Simulator) [BF0CF896-400A-4CF8-8501-C4EC41D451BA]","iPhone 6 Plus (8.0 Simulator) [3646BEC6-C424-4DBE-BDB3-341AD9730B76]"]
info: [debug] Responding to client with error: {"status":33,"value":{"message":"A new session could not be created. (Original error: Could not find a device to launch. You requested 'iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500) (7.0 Simulator)', but the available devices were: [\"iPad 2 (8.0 Simulator) [943A7599-5AC3-4A47-89FE-6A2B1D971DE2]\",\"iPad Air (8.0 Simulator) [74ADF11C-30D1-4788-BB08-B6B96CFB3792]\",\"iPad Retina (8.0 Simulator) [5D89C54B-FD2C-4FDF-9097-231117041708]\",\"iPhone 4s (8.0 Simulator) [2F88059E-0FB2-47A3-A63C-2BCC47742B06]\",\"iPhone 5 (8.0 Simulator) [4D83AB08-625F-4E53-A34E-051D1CDEF727]\",\"iPhone 5s (8.0 Simulator) [545A4765-F808-42BE-A416-9A057781942E]\",\"iPhone 6 (8.0 Simulator) [BF0CF896-400A-4CF8-8501-C4EC41D451BA]\",\"iPhone 6 Plus (8.0 Simulator) [3646BEC6-C424-4DBE-BDB3-341AD9730B76]\"])","origValue":"Could not find a device to launch. You requested 'iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500) (7.0 Simulator)', but the available devices were: [\"iPad 2 (8.0 Simulator) [943A7599-5AC3-4A47-89FE-6A2B1D971DE2]\",\"iPad Air (8.0 Simulator) [74ADF11C-30D1-4788-BB08-B6B96CFB3792]\",\"iPad Retina (8.0 Simulator) [5D89C54B-FD2C-4FDF-9097-231117041708]\",\"iPhone 4s (8.0 Simulator) [2F88059E-0FB2-47A3-A63C-2BCC47742B06]\",\"iPhone 5 (8.0 Simulator) [4D83AB08-625F-4E53-A34E-051D1CDEF727]\",\"iPhone 5s (8.0 Simulator) [545A4765-F808-42BE-A416-9A057781942E]\",\"iPhone 6 (8.0 Simulator) [BF0CF896-400A-4CF8-8501-C4EC41D451BA]\",\"iPhone 6 Plus (8.0 Simulator) [3646BEC6-C424-4DBE-BDB3-341AD9730B76]\"]"},"sessionId":null}
info: <-- POST /wd/hub/session 500 661.240 ms - 1536
error: Failed to start an Appium session, err was: Error: Could not find a device to launch. You requested 'iPhone 5 iOS 7 (9BB5E703-71D0-452C-8775-8EEEA497E500) (7.0 Simulator)', but the available devices were: ["iPad 2 (8.0 Simulator) [943A7599-5AC3-4A47-89FE-6A2B1D971DE2]","iPad Air (8.0 Simulator) [74ADF11C-30D1-4788-BB08-B6B96CFB3792]","iPad Retina (8.0 Simulator) [5D89C54B-FD2C-4FDF-9097-231117041708]","iPhone 4s (8.0 Simulator) [2F88059E-0FB2-47A3-A63C-2BCC47742B06]","iPhone 5 (8.0 Simulator) [4D83AB08-625F-4E53-A34E-051D1CDEF727]","iPhone 5s (8.0 Simulator) [545A4765-F808-42BE-A416-9A057781942E]","iPhone 6 (8.0 Simulator) [BF0CF896-400A-4CF8-8501-C4EC41D451BA]","iPhone 6 Plus (8.0 Simulator) [3646BEC6-C424-4DBE-BDB3-341AD9730B76]"]
info: --> GET /wd/hub/status {}
info: [debug] Responding to client with success: {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}
info: <-- GET /wd/hub/status 200 0.905 ms - 104 {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}
info: --> GET /wd/hub/status {}
info: [debug] Responding to client with success: {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}
info: <-- GET /wd/hub/status 200 1.280 ms - 104 {"status":0,"value":{"build":{"version":"1.3.6","revision":"004f52f249d3513809e7d0734d9205d1fec19f8e"}}}