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Your environment may be more complex than a simple single Open Directory server or straightforward Active Directory configuration. Additionally, you may need to automate binding for hundreds of machines. These topics are a little beyond the scope of this book. Never fear! There are other resources that cover these topics. One excellent resource is Enterprise Mac Administrator s Guide, by Charles Edge, Zack Smith, and Beau Hunter (http://apress.com/book/view/9781430224433). Learning at least basic scripting skills is important to all system administrators in order to automate tasks. This and other chapters in this book provide some scripts that will get you started with specific tasks; however, you should be able to not only read these scripts, but also customize them for your specific needs. A good way to get started is bash shell scripting. One excellent resource for learning bash is The bash Scripting Guide, provided free thanks to the Linux Documentation Project (http://tldp.org/LDP/Bash-Beginners-Guide/html). Since the basics of bash are common no matter which platform you re using, don t be put off by seeing Linux in the title; it ll be just the same under Mac OS X. If you need greater details on the implementation of how Directory Services work in Mac OS X, Apple Training Series: Mac OS X Directory Services v10.6: A Guide to Configuring Directory Services on Mac OS X and Mac OS X Server v10.6 Snow Leopard, by Arek Dreyer and Ben Greisler, is a perfect guide.

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> open System.IO;; > [@"C:\Program Files"; @"C:\Windows"] |> List.map Directory.GetDirectories;; val it : string [] list = [ [|"C:\\Program Files\\Adobe"; "C:\\Program Files\\Apoint"; "C:\\Program Files\\CA"; "C:\\Program Files\\CE Remote Tools"; ...]; ... ] Sometimes you will need to add extra type information to indicate which overload of the method is required. We discuss method overloading in more detail in 6. For example, the following causes an error: > open System;; > let f = Console.WriteLine;; C:\misc\test.ml(11,8): error: FS0041: The method WriteLine is overloaded. Possible matches are shown below. Resolve the overloading by adding further type annotations to the arguments. Possible overload: 'Console.WriteLine(bool value) : unit'. Possible overload: 'Console.WriteLine(char value) : unit'. ... However, the following succeeds: > let f = (Console.WriteLine : string -> unit);; val f : string -> unit

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One important tool in F# programming is pattern matching, a general construct that combines decomposition and control. In the previous sections, you got a taste of how you can use pattern matching with tuple, list, and option values. However, you can also use pattern matching in many other situations. You ll see many other examples of pattern matching in this book, but let s start with some simple pattern matching over strings and integers. As you ve already seen, pattern matches on explicit values are introduced using the match ... with ... construct: let urlFilter url agent = match (url,agent) with | "http://www.control.org", 99 -> true | "http://www.kaos.org" , _ -> false | _, 86 -> true | _ -> false

The inferred type of the function is as follows:

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In the previous chapter, we looked at using commonly available centralized network directories to deliver Managed Preferences data to your managed machines. But not all organizations have a centralized directory. In this chapter, we ll show how you can manage preferences for your machines without a network directory service.

The expression (url,agent) after the keyword match is a tuple of type (string*int). Each rule of the match is introduced with a | followed by a pattern, then ->, and then a result expression. When executed, the patterns of the rules are used one by one, and the first successful pattern match determines which result expression is used. In the previous example, the first pattern will match if url and agent are "http://www.control.org" and 99, respectively. The next will match if url is "http://www.kaos.org". The third pattern will match if agent is 86. The last three rules all use wildcard patterns represented by the underscore character; these match all inputs. The overall conditions under which urlFilter returns true can be read off simply by reading through the pattern match: agent 99 can access "http://www.control.org", no one can access "http://www.kaos.org", and, excluding the latter, agent 86 can access anything. Patterns are a rich and powerful technique for simultaneous data analysis and decomposition. Table 3-12 summarizes all the ways to form patterns in F#; many of these involve building up patterns from other patterns. The sections that follow look at some of these constructs, and we cover active patterns in 9.

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