Windows PowerShell v2实战指南：权威全面升级版

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CONTENTS xv

15.3 Extending the ISE 622

The $psISE variable 622 ✦ Using the Options property 624

Managing tabs and files 625 ✦ Working with text panes 629

Adding a custom menu 633

15.4 PowerShell script debugging features 638

The Set-PSDebug cmdlet 638 ✦ Nested prompts and the

Suspend operation 643

15.5 The PowerShell v2 debugger 647

The graphical debugger 648

15.6 Command-line debugging 652

Working with breakpoint objects 653 ✦ Setting breakpoints

on commands 656 ✦ Setting breakpoints on variable

assignment 657 ✦ Debugger limitations and issues 658

15.7 Summary 659

Part 2 Using PowerShell 661

16 Working with files, text, and XML 663

16.1 PowerShell and paths 664

Providers and the core cmdlets 664 ✦ Working with

PSDrives 665 ✦ Working with paths that contain

wildcards 667 ✦ Suppressing wildcard processing

in paths 668 ✦ The -LiteralPath parameter 670

The Registry provider 671

16.2 File processing 672

Reading and writing files 674 ✦ Writing files 679 ✦ All

together now—reading and writing 680 ✦ Performance caveats

with Get-Content 680

16.3 Processing unstructured text 681

Using System.String to work with text 681 ✦ Using hashtables to

count unique words 684 ✦ Using regular expressions to

manipulate text 686 ✦ Searching files with the Select-String

cmdlet 688

16.4 XML structured text processing 693

Using XML as objects 693 ✦ Adding elements to an XML

object 695 ✦ Loading and saving XML files 697

Processing XML documents in a pipeline 701 ✦ Processing

XML with XPath 702 ✦ A hint of XLinq 709 ✦ Rendering

objects as XML 711

16.5 Summary 717

xix

preface

Well, it’s been a wild ride since the first edition of this book was released. At that

time, PowerShell had just shipped and had a fairly limited scope of influence. Things

have changed a lot. PowerShell now ships in the box with Windows (at least Win-

dows 7 and Server 2008 R2). The number of PowerShell users is now in the hundreds

of thousands, if not millions (this is not a formal estimate—I just looked at some of

the download counters for PowerShell-related tools and went from there).

One of the biggest events from my perspective was the release of PowerShell version

2 in July of 2009. Obviously it was time for a sequel to the book. I put together a short

proposal and estimate of the amount of work needed to update the book. The initial

estimate was for a few months of work—a couple of new chapters, a few updates here

and there, and we’re good to go. Wow, was I ever wrong about that! PowerShell v2

was a really big release.

When you are in the middle of something, working heads down, you tend to lose

perspective of the overall project—that old forest/trees problem. It wasn’t until I was

preparing a talk for MMS (Microsoft Management Summit) that I realized just how

BIG it was. In a one-hour talk, we barely had time to list all of the new stuff, much

less describe it in detail. But describing it in detail was exactly what I needed to do and

that’s why this book took a great deal longer to write than anticipated. It’s also much

bigger than I had expected or wanted. At one point it was double the size of the first

edition. So we cut some stuff that was no longer as relevant with PowerShell v2, moved

some stuff into the online appendixes, and capped the book at about 1000 pages.

So why write the book in the first place? The answer is the same now as it was

then—I wanted the PowerShell community to have a way to see “inside the box” and

have a more intimate insight into the goals and motivations behind PowerShell.

Although PowerShell draws heavily from existing technologies, it combines them in

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