建一个xcode工程。。OS X > Application > Command Line Tool因为我们只是想玩玩swift语言特性不做UI.

product name; example

org name: cyper  org id: me.cyper bundle id: me.cyper.example 保存在桌面.  example > example.xcodeprojexample > example/main.swift  

选择products>example，右边identity and type, type选择Unix-Executable可以看到生成的可执行文件的全路径

/Users/cyper/Library/Developer/Xcode/DerivedData/example-ajcwintjwwixdreqjjijwrzqriom/Build/Products/Debug/example 这个hello world文件大约5M

➜  Debug  $ pwd/Users/cyper/Library/Developer/Xcode/DerivedData/example-ajcwintjwwixdreqjjijwrzqriom/Build/Products/Debug➜  Debug  $ lltotal 10904-rwxr-xr-x  1 cyper  staff   5.3M Oct 10 20:03 exampledrwxr-xr-x  4 cyper  staff   136B Oct 10 20:00 example.swiftmodule/➜  Debug  $ ./exampleHello, World!➜  Debug  $