Put quotes around path.  By default, Xcode side by side installs of 5 & ...

I put quotes around path for instrumentation call to get device list.  On my side by side Xcode installs of 5 & 6, put 6 in 'Xcode 2.app'.  I was getting this error:

error: Failed to start an Appium session, err was: Error: Command failed: /bin/sh: /Applications/Xcode: No such file or directory