Holmes Lee - PowerShell Cookbook, 4th Edition [2021, PDF/EPUB, ENG]

Примеры страниц

Оглавление

Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
Part I. Tour
A Guided Tour of PowerShell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxi
Part II. Fundamentals
1. The PowerShell Interactive Shell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.0 Introduction 1
1.1 Install PowerShell Core 1
1.2 Run Programs, Scripts, and Existing Tools 5
1.3 Run a PowerShell Command 8
1.4 Resolve Errors Calling Native Executables 9
1.5 Supply Default Values for Parameters 11
1.6 Invoke a Long-Running or Background Command 13
1.7 Program: Monitor a Command for Changes 16
1.8 Notify Yourself of Job Completion 20
1.9 Customize Your Shell, Profile, and Prompt 21
1.10 Customize PowerShell’s User Input Behavior 24
1.11 Customize PowerShell’s Command Resolution Behavior 27
1.12 Find a Command to Accomplish a Task 30
1.13 Get Help on a Command 32
1.14 Update System Help Content 34
1.15 Program: Search Help for Text 36
iii
1.16 Launch PowerShell at a Specific Location 37
1.17 Invoke a PowerShell Command or Script from Outside PowerShell 39
1.18 Understand and Customize PowerShell’s Tab Completion 42
1.19 Program: Learn Aliases for Common Commands 46
1.20 Program: Learn Aliases for Common Parameters 48
1.21 Access and Manage Your Console History 50
1.22 Program: Create Scripts from Your Session History 52
1.23 Invoke a Command from Your Session History 54
1.24 Program: Search Formatted Output for a Pattern 56
1.25 Interactively View and Process Command Output 57
1.26 Program: Interactively View and Explore Objects 59
1.27 Record a Transcript of Your Shell Session 67
1.28 Extend Your Shell with Additional Commands 68
1.29 Find and Install Additional PowerShell Scripts and Modules 70
1.30 Use Commands from Customized Shells 72
1.31 Save State Between Sessions 73
2. Pipelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
2.0 Introduction 77
2.1 Chain Commands Based on Their Success or Error 78
2.2 Filter Items in a List or Command Output 79
2.3 Group and Pivot Data by Name 81
2.4 Interactively Filter Lists of Objects 84
2.5 Work with Each Item in a List or Command Output 84
2.6 Automate Data-Intensive Tasks 88
2.7 Intercept Stages of the Pipeline 92
2.8 Automatically Capture Pipeline Output 93
2.9 Capture and Redirect Binary Process Output 95
3. Variables and Objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
3.0 Introduction 101
3.1 Display the Properties of an Item as a List 102
3.2 Display the Properties of an Item as a Table 104
3.3 Store Information in Variables 106
3.4 Access Environment Variables 107
3.5 Program: Retain Changes to Environment Variables Set by a Batch File 110
3.6 Control Access and Scope of Variables and Other Items 112
3.7 Program: Create a Dynamic Variable 114
3.8 Work with .NET Objects 117
3.9 Create an Instance of a .NET Object 121
3.10 Create Instances of Generic Objects 124
3.11 Use a COM Object 125
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3.12 Learn About Types and Objects 126
3.13 Get Detailed Documentation About Types and Objects 128
3.14 Add Custom Methods and Properties to Objects 130
3.15 Create and Initialize Custom Objects 132
3.16 Add Custom Methods and Properties to Types 136
3.17 Define Custom Formatting for a Type 141
4. Looping and Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
4.0 Introduction 145
4.1 Make Decisions with Comparison and Logical Operators 145
4.2 Adjust Script Flow Using Conditional Statements 148
4.3 Manage Large Conditional Statements with Switches 149
4.4 Repeat Operations with Loops 152
4.5 Process Time-Consuming Action in Parallel 154
4.6 Add a Pause or Delay 157
5. Strings and Unstructured Text. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
5.0 Introduction 159
5.1 Create a String 159
5.2 Create a Multiline or Formatted String 161
5.3 Place Special Characters in a String 162
5.4 Insert Dynamic Information in a String 163
5.5 Prevent a String from Including Dynamic Information 164
5.6 Place Formatted Information in a String 165
5.7 Search a String for Text or a Pattern 167
5.8 Replace Text in a String 169
5.9 Split a String on Text or a Pattern 171
5.10 Combine Strings into a Larger String 173
5.11 Convert a String to Uppercase or Lowercase 175
5.12 Trim a String 177
5.13 Format a Date for Output 178
5.14 Convert a String Between One Format and Another 180
5.15 Convert Text Streams to Objects 181
5.16 Generate Large Reports and Text Streams 186
5.17 Generate Source Code and Other Repetitive Text 188
6. Calculations and Math. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
6.0 Introduction 193
6.1 Perform Simple Arithmetic 193
6.2 Perform Complex Arithmetic 195
6.3 Measure Statistical Properties of a List 198
6.4 Work with Numbers as Binary 200
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6.5 Simplify Math with Administrative Constants 204
6.6 Convert Numbers Between Bases 205
7. Lists, Arrays, and Hashtables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
7.0 Introduction 209
7.1 Create an Array or List of Items 209
7.2 Create a Jagged or Multidimensional Array 211
7.3 Access Elements of an Array 212
7.4 Visit Each Element of an Array 214
7.5 Sort an Array or List of Items 215
7.6 Determine Whether an Array Contains an Item 216
7.7 Combine Two Arrays 217
7.8 Find Items in an Array That Match a Value 218
7.9 Compare Two Lists 219
7.10 Remove Elements from an Array 220
7.11 Find Items in an Array Greater or Less Than a Value 221
7.12 Use the ArrayList Class for Advanced Array Tasks 222
7.13 Create a Hashtable or Associative Array 223
7.14 Sort a Hashtable by Key or Value 225
8. Utility Tasks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
8.0 Introduction 229
8.1 Get the System Date and Time 229
8.2 Measure the Duration of a Command 230
8.3 Read and Write from the Clipboard 232
8.4 Generate a Random Number or Object 233
8.5 Convert Time Between Time Zones 235
8.6 Program: Search the Windows Start Menu 236
8.7 Program: Show Colorized Script Content 237
Part III. Common Tasks
9. Simple Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
9.0 Introduction 245
9.1 Get the Content of a File 245
9.2 Store the Output of a Command into a File 247
9.3 Add Information to the End of a File 248
9.4 Search a File for Text or a Pattern 249
9.5 Parse and Manage Text-Based Logfiles 252
9.6 Parse and Manage Binary Files 255
9.7 Create and Manage Temporary Files 257
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9.8 Search and Replace Text in a File 259
9.9 Program: Get the Encoding of a File 262
9.10 View the Hexadecimal Representation of Content 265
10. Structured Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
10.0 Introduction 267
10.1 Access Information in an XML File 268
10.2 Perform an XPath Query Against XML 270
10.3 Convert Objects to XML 272
10.4 Modify Data in an XML File 273
10.5 Easily Import and Export Your Structured Data 275
10.6 Store the Output of a Command in a CSV or Delimited File 277
10.7 Import CSV and Delimited Data from a File 278
10.8 Manage JSON Data Streams 280
10.9 Use Excel to Manage Command Output 281
10.10 Parse and Interpret PowerShell Scripts 283
11. Code Reuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
11.0 Introduction 287
11.1 Write a Script 287
11.2 Write a Function 290
11.3 Find a Verb Appropriate for a Command Name 292
11.4 Write a Script Block 293
11.5 Return Data from a Script, Function, or Script Block 295
11.6 Package Common Commands in a Module 297
11.7 Write Commands That Maintain State 301
11.8 Selectively Export Commands from a Module 303
11.9 Diagnose and Interact with Internal Module State 305
11.10 Handle Cleanup Tasks When a Module Is Removed 307
11.11 Access Arguments of a Script, Function, or Script Block 308
11.12 Add Validation to Parameters 314
11.13 Accept Script Block Parameters with Local Variables 318
11.14 Dynamically Compose Command Parameters 320
11.15 Provide -WhatIf, -Confirm, and Other Cmdlet Features 322
11.16 Add Help to Scripts or Functions 325
11.17 Add Custom Tags to a Function or Script Block 327
11.18 Access a Script’s Pipeline Input 329
11.19 Write Pipeline-Oriented Scripts with Cmdlet Keywords 331
11.20 Write a Pipeline-Oriented Function 335
11.21 Organize Scripts for Improved Readability 336
11.22 Invoke Dynamically Named Commands 338
11.23 Program: Enhance or Extend an Existing Cmdlet 340
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12. Internet-Enabled Scripts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347
12.0 Introduction 347
12.1 Download a File from an FTP or Internet Site 347
12.2 Upload a File to an FTP Site 348
12.3 Program: Resolve the Destination of an Internet Redirect 350
12.4 Download a Web Page from the Internet 351
12.5 Parse and Analyze a Web Page from the Internet 357
12.6 Script a Web Application Session 359
12.7 Interact with REST-Based Web APIs 363
12.8 Connect to a Web Service 366
12.9 Interact with and Manage Remote SSL Certificates 367
12.10 Export Command Output as a Web Page 369
12.11 Send an Email 369
12.12 Program: Monitor Website Uptimes 370
12.13 Program: Interact with Internet Protocols 372
13. User Interaction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
13.0 Introduction 379
13.1 Read a Line of User Input 379
13.2 Read a Key of User Input 380
13.3 Program: Display a Menu to the User 381
13.4 Display Messages and Output to the User 383
13.5 Provide Progress Updates on Long-Running Tasks 386
13.6 Write Culture-Aware Scripts 388
13.7 Support Other Languages in Script Output 391
13.8 Program: Invoke a Script Block with Alternate Culture Settings 394
13.9 Access Features of the Host’s UI 395
13.10 Add a Graphical User Interface to Your Script 397
13.11 Program: Add a Console UI to Your Script 400
13.12 Interact with MTA Objects 402
14. Debugging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405
14.0 Introduction 405
14.1 Prevent Common Scripting Errors 407
14.2 Write Unit Tests for your Scripts 409
14.3 Trace Script Execution 411
14.4 Set a Script Breakpoint 414
14.5 Debug a Script When It Encounters an Error 417
14.6 Create a Conditional Breakpoint 419
14.7 Investigate System State While Debugging 421
14.8 Debug a Script on a Remote Machine 424
14.9 Program: Watch an Expression for Changes 426
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14.10 Debug a Script in Another Process 428
14.11 Program: Get Script Code Coverage 430
15. Tracing and Error Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
15.0 Introduction 433
15.1 Determine the Status of the Last Command 434
15.2 View the Errors Generated by a Command 435
15.3 Manage the Error Output of Commands 437
15.4 Program: Resolve an Error 439
15.5 Configure Debug, Verbose, and Progress Output 440
15.6 Handle Warnings, Errors, and Terminating Errors 442
15.7 Output Warnings, Errors, and Terminating Errors 445
15.8 Analyze a Script’s Performance Profile 446
16. Environmental Awareness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
16.0 Introduction 449
16.1 View and Modify Environment Variables 449
16.2 Modify the User or System Path 451
16.3 Access Information About Your Command’s Invocation 452
16.4 Program: Investigate the InvocationInfo Variable 454
16.5 Find Your Script’s Name 457
16.6 Find Your Script’s Location 457
16.7 Find the Location of Common System Paths 458
16.8 Get the Current Location 461
16.9 Safely Build File Paths Out of Their Components 462
16.10 Interact with PowerShell’s Global Environment 463
16.11 Determine PowerShell Version Information 464
16.12 Test for Administrative Privileges 465
17. Extend the Reach of PowerShell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467
17.0 Introduction 467
17.1 Automate Programs Using COM Scripting Interfaces 467
17.2 Program: Query a SQL Data Source 469
17.3 Access Windows Performance Counters 472
17.4 Access Windows API Functions 474
17.5 Program: Invoke Simple Windows API Calls 481
17.6 Define or Extend a .NET Class 484
17.7 Add Inline C# to Your PowerShell Script 487
17.8 Access a .NET SDK Library 489
17.9 Create Your Own PowerShell Cmdlet 491
17.10 Add PowerShell Scripting to Your Own Program 494
Table of Contents | ix
18. Security and Script Signing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499
18.0 Introduction 499
18.1 Enable Scripting Through an Execution Policy 501
18.2 Enable PowerShell Security Logging 504
18.3 Disable Warnings for UNC Paths 509
18.4 Sign a PowerShell Script, Module, or Formatting File 510
18.5 Create a Self-Signed Certificate 512
18.6 Manage PowerShell Security in an Enterprise 513
18.7 Block Scripts by Publisher, Path, or Hash 515
18.8 Verify the Digital Signature of a PowerShell Script 518
18.9 Securely Handle Sensitive Information 519
18.10 Securely Request Usernames and Passwords 521
18.11 Start a Process as Another User 523
18.12 Program: Run a Temporarily Elevated Command 524
18.13 Securely Store Credentials on Disk 526
18.14 Access User and Machine Certificates 528
18.15 Program: Search the Certificate Store 529
18.16 Add and Remove Certificates 531
18.17 Manage Security Descriptors in SDDL Form 532
18.18 Create a Task-Specific Remoting Endpoint 534
18.19 Limit Interactive Use of PowerShell 537
18.20 Detect and Prevent Code Injection Vulnerabilities 539
18.21 Get the Cryptographic Hash of a File 543
18.22 Capture and Validate Integrity of File Sets 544
19. Visual Studio Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 547
19.0 Introduction 547
19.1 Debug a Script 549
19.2 Connect to a Remote Computer 551
19.3 Interact with Visual Studio Code Through Its Object Model 552
19.4 Quickly Insert Script Snippets 553
Part IV. Administrator Tasks
20. Files and Directories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557
20.0 Introduction 557
20.1 Determine and Change the Current Location 558
20.2 Get the Files in a Directory 560
20.3 Find All Files Modified Before a Certain Date 562
20.4 Clear the Content of a File 563
20.5 Manage and Change the Attributes of a File 564
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20.6 Find Files That Match a Pattern 565
20.7 Manage Files That Include Special Characters 568
20.8 Program: Get Disk Usage Information 569
20.9 Monitor a File for Changes 571
20.10 Get the Version of a DLL or Executable 572
20.11 Create a Directory 573
20.12 Remove a File or Directory 573
20.13 Rename a File or Directory 574
20.14 Move a File or Directory 576
20.15 Create and Map PowerShell Drives 576
20.16 Access Long File and Directory Names 578
20.17 Unblock a File 579
20.18 Interact with Alternate Data Streams 581
20.19 Program: Move or Remove a Locked File 582
20.20 Get the ACL of a File or Directory 584
20.21 Set the ACL of a File or Directory 586
20.22 Program: Add Extended File Properties to Files 587
20.23 Manage ZIP Archives 590
21. The Windows Registry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593
21.0 Introduction 593
21.1 Navigate the Registry 593
21.2 View a Registry Key 594
21.3 Modify or Remove a Registry Key Value 595
21.4 Create a Registry Key Value 596
21.5 Remove a Registry Key 597
21.6 Safely Combine Related Registry Modifications 598
21.7 Add a Site to an Internet Explorer Security Zone 600
21.8 Modify Internet Explorer Settings 602
21.9 Program: Search the Windows Registry 603
21.10 Get the ACL of a Registry Key 605
21.11 Set the ACL of a Registry Key 606
21.12 Work with the Registry of a Remote Computer 608
21.13 Program: Get Registry Items from Remote Machines 610
21.14 Program: Get Properties of Remote Registry Keys 612
21.15 Program: Set Properties of Remote Registry Keys 613
21.16 Discover Registry Settings for Programs 615
22. Comparing Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 619
22.0 Introduction 619
22.1 Compare the Output of Two Commands 619
22.2 Determine the Differences Between Two Files 621
Table of Contents | xi
23. Event Logs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623
23.0 Introduction 623
23.1 List All Event Logs 623
23.2 Get the Oldest Entries from an Event Log 624
23.3 Find Event Log Entries with Specific Text 625
23.4 Retrieve and Filter Event Log Entries 627
23.5 Find Event Log Entries by Their Frequency 630
23.6 Back Up an Event Log 632
23.7 Create or Remove an Event Log 633
23.8 Write to an Event Log 635
23.9 Run a PowerShell Script for Windows Event Log Entries 636
23.10 Clear or Maintain an Event Log 637
23.11 Access Event Logs of a Remote Machine 639
24. Processes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 641
24.0 Introduction 641
24.1 List Currently Running Processes 642
24.2 Launch the Application Associated with a Document 643
24.3 Launch a Process 644
24.4 Stop a Process 646
24.5 Get the Owner of a Process 647
24.6 Get the Parent Process of a Process 648
24.7 Debug a Process 649
25. System Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 651
25.0 Introduction 651
25.1 List All Running Services 651
25.2 Manage a Running Service 653
25.3 Configure a Service 654
26. Active Directory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 655
26.0 Introduction 655
26.1 Test Active Directory Scripts on a Local Installation 656
26.2 Create an Organizational Unit 658
26.3 Get the Properties of an Organizational Unit 659
26.4 Modify Properties of an Organizational Unit 660
26.5 Delete an Organizational Unit 661
26.6 Get the Children of an Active Directory Container 662
26.7 Create a User Account 662
26.8 Program: Import Users in Bulk to Active Directory 663
26.9 Search for a User Account 666
26.10 Get and List the Properties of a User Account 667
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26.11 Modify Properties of a User Account 667
26.12 Change a User Password 668
26.13 Create a Security or Distribution Group 669
26.14 Search for a Security or Distribution Group 670
26.15 Get the Properties of a Group 671
26.16 Find the Owner of a Group 672
26.17 Modify Properties of a Security or Distribution Group 673
26.18 Add a User to a Security or Distribution Group 674
26.19 Remove a User from a Security or Distribution Group 674
26.20 List a User’s Group Membership 675
26.21 List the Members of a Group 676
26.22 List the Users in an Organizational Unit 676
26.23 Search for a Computer Account 677
26.24 Get and List the Properties of a Computer Account 679
27. Enterprise Computer Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 681
27.0 Introduction 681
27.1 Join a Computer to a Domain or Workgroup 681
27.2 Remove a Computer from a Domain 682
27.3 Rename a Computer 683
27.4 Program: List Logon or Logoff Scripts for a User 684
27.5 Program: List Startup or Shutdown Scripts for a Machine 685
27.6 Deploy PowerShell-Based Logon Scripts 687
27.7 Enable or Disable the Windows Firewall 688
27.8 Open or Close Ports in the Windows Firewall 688
27.9 Program: List All Installed Software 689
27.10 Uninstall an Application 691
27.11 Manage Computer Restore Points 692
27.12 Reboot or Shut Down a Computer 694
27.13 Determine Whether a Hotfix Is Installed 695
27.14 Manage Scheduled Tasks on a Computer 696
27.15 Retrieve Printer Information 699
27.16 Retrieve Printer Queue Statistics 700
27.17 Manage Printers and Print Queues 702
27.18 Program: Summarize System Information 703
27.19 Renew a DHCP Lease 705
27.20 Assign a Static IP Address 706
27.21 List All IP Addresses for a Computer 708
27.22 List Network Adapter Properties 709
28. CIM and Windows Management Instrumentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 711
28.0 Introduction 711
Table of Contents | xiii
28.1 Access Windows Management Instrumentation and CIM Data 713
28.2 Modify the Properties of a WMI or CIM Instance 716
28.3 Invoke a Method on a WMI Instance or Class 718
28.4 Program: Determine Properties Available to WMI and CIM Filters 719
28.5 Search for the WMI or CIM Class to Accomplish a Task 720
28.6 Use .NET to Perform Advanced WMI Tasks 725
28.7 Convert a VBScript WMI Script to PowerShell 726
29. Remoting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 731
29.0 Introduction 731
29.1 Find Commands That Support Their Own Remoting 732
29.2 Enable PowerShell Remoting on a Computer 733
29.3 Enable SSH as a PowerShell Remoting Transport 735
29.4 Interactively Manage a Remote Computer 737
29.5 Invoke a Command on a Remote Computer 740
29.6 Disconnect and Reconnect PowerShell Sessions 744
29.7 Program: Remotely Enable PowerShell Remoting 746
29.8 Program: Invoke a PowerShell Expression on a Remote Machine 747
29.9 Test Connectivity Between Two Computers 750
29.10 Limit Networking Scripts to Hosts That Respond 753
29.11 Enable Remote Desktop on a Computer 754
29.12 Configure User Permissions for Remoting 754
29.13 Enable Remoting to Workgroup Computers 756
29.14 Implicitly Invoke Commands from a Remote Computer 758
29.15 Create Sessions with Full Network Access 760
29.16 Pass Variables to Remote Sessions 763
29.17 Manage and Edit Files on Remote Machines 765
29.18 Configure Advanced Remoting Quotas and Options 767
29.19 Invoke a Command on Many Computers 769
29.20 Run a Local Script on a Remote Computer 771
29.21 Determine Whether a Script Is Running on a Remote Computer 772
30. Transactions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 773
30.0 Introduction 773
30.1 Safely Experiment with Transactions 775
30.2 Change Error Recovery Behavior in Transactions 777
31. Event Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 781
31.0 Introduction 781
31.1 Respond to Automatically Generated Events 782
31.2 Create and Respond to Custom Events 785
31.3 Create a Temporary Event Subscription 788
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31.4 Forward Events from a Remote Computer 789
31.5 Investigate Internal Event Action State 790
31.6 Use a Script Block as a .NET Delegate or Event Handler 792
Part V. References
A. PowerShell Language and Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797
B. Regular Expression Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 861
C. XPath Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 871
D. .NET String Formatting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 875
E. .NET DateTime Formatting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 879
F. Selected .NET Classes and Their Uses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 885
G. WMI Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 893
H. Selected COM Objects and Their Uses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 899
I. Selected Events and Their Uses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903
J. Standard PowerShell Verbs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 911
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 917