I was using below command for 1.4.13, but it does not works on 1.5.2 , The bin folder now contains
ios-webkit-debug-proxy-launcher.js
/Applications/Appium.app/Contents/Resources/node/bin/node /Applications/Appium.app/Contents/Resources/node_modules/appium/bin/appium.js
Got it.
/Applications/Appium.app/Contents/Resources/node/bin/node /Applications/Appium.app/Contents/Resources/node_modules/appium/build/lib/main.js
it is posted, you need to use main.js
/Applications/Appium.app/Contents/Resources/node/bin/node /Applications/Appium.app/Contents/Resources/node_modules/appium/build/lib/main.js