Detect operating system

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open System

type OS =
        | OSX            
        | Windows
        | Linux

let getOS = 
        match int Environment.OSVersion.Platform with
        | 4 | 128 -> Linux
        | 6       -> OSX
        | _       -> Windows

namespace System

type OS =
  | OSX
  | Windows
  | Linux

Full name: Script.OS

union case OS.OSX: OS

Multiple items
union case OS.Windows: OS

--------------------
namespace System.Windows

union case OS.Linux: OS

val getOS : OS

Full name: Script.getOS

Multiple items
val int : value:'T -> int (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.int

--------------------
type int = int32

Full name: Microsoft.FSharp.Core.int

--------------------
type int<'Measure> = int

Full name: Microsoft.FSharp.Core.int<_>

type Environment =
  static member CommandLine : string
  static member CurrentDirectory : string with get, set
  static member Exit : exitCode:int -> unit
  static member ExitCode : int with get, set
  static member ExpandEnvironmentVariables : name:string -> string
  static member FailFast : message:string -> unit + 1 overload
  static member GetCommandLineArgs : unit -> string[]
  static member GetEnvironmentVariable : variable:string -> string + 1 overload
  static member GetEnvironmentVariables : unit -> IDictionary + 1 overload
  static member GetFolderPath : folder:SpecialFolder -> string + 1 overload
  ...
  nested type SpecialFolder
  nested type SpecialFolderOption

Full name: System.Environment

property Environment.OSVersion: OperatingSystem

property OperatingSystem.Platform: PlatformID