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PowerShell 7 Workshop

PowerShell 7 Workshop

By : Nick Parlow
3.7 (3)
Buy this Book
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PowerShell 7 Workshop

PowerShell 7 Workshop

3.7 (3)
By: Nick Parlow
Buy this Book

Overview of this book

Discover the capabilities of PowerShell 7 for your everyday tasks with this carefully paced tutorial that will help you master this versatile programming language. The first set of chapters will show you where to find and how to install the latest version of PowerShell, providing insights into the distinctive features that set PowerShell apart from other languages. You’ll then learn essential programming concepts such as variables and control flow, progressing to their applications. As you advance, you’ll work with files and APIs, writing scripts, functions, and modules. You’ll also gain proficiency in securing your PowerShell environment before venturing into different operating systems. Enriched with detailed practical examples tailored for Windows, Linux, macOS, and Raspberry Pi, each chapter weaves real-world scenarios to ignite your imagination and cement the principles you learn. You’ll be able to reinforce your understanding through self-assessment questions and delve deeper into the principles using comprehensive reading lists. By the end of this book, you’ll have the confidence to use PowerShell for physical computing and writing scripts for Windows administration.
Table of Contents (23 chapters)
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Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Conventions used
Get in touch
Share your thoughts
Download a free PDF copy of this book
1
Part 1: PowerShell Fundamentals
Part 1: PowerShell Fundamentals
Free Chapter
2
Chapter 1: Introduction to PowerShell 7 – What It Is and How to Get It
Chapter 1: Introduction to PowerShell 7 – What It Is and How to Get It
Technical requirements
What is PowerShell 7?
What is PowerShell 7 used for?
Getting PowerShell 7
Running PowerShell 7
Getting help
Summary
Exercises
Further reading
3
Chapter 2: Exploring PowerShell Cmdlets and Syntax
Chapter 2: Exploring PowerShell Cmdlets and Syntax
Technical requirements
What are cmdlets?
Understanding cmdlet syntax
How to find more cmdlets
Working interactively with PowerShell
Summary
Exercises
4
Chapter 3: The PowerShell Pipeline – How to String Cmdlets Together
Chapter 3: The PowerShell Pipeline – How to String Cmdlets Together
How to bring cmdlets together – the pipeline
Selecting and sorting objects
Filtering objects
Enumerating objects
How the pipeline works – parameter binding
Troubleshooting the pipeline – pipeline tracing
Summary
Exercises
Further reading
5
Chapter 4: PowerShell Variables and Data Structures
Chapter 4: PowerShell Variables and Data Structures
Understanding PowerShell variables
Exploring object types
Discovering value types
Typing explained
Navigating reference types
Splatting – a cool use for hashtables
Summary
Exercises
Further reading
6
Chapter 5: PowerShell Control Flow – Conditionals and Loops
Chapter 5: PowerShell Control Flow – Conditionals and Loops
An introduction to IDEs and VS Code
Conditional control – if, else, elseif, and switch
Loops – foreach, do while, do until, while, for
Breaking and continuing
Let’s play a game
Summary
Exercises
Further reading
7
Chapter 6: PowerShell and Files – Reading, Writing, and Manipulating Data
Chapter 6: PowerShell and Files – Reading, Writing, and Manipulating Data
Understanding formatting
Writing a text file
Using ConvertTo- and Export- cmdlets
Handling files
Working with files
Let’s have some fun – measuring the most frequent words in a text file
Summary
Exercises
Further reading
8
Chapter 7: PowerShell and the Web – HTTP, REST, and JSON
Chapter 7: PowerShell and the Web – HTTP, REST, and JSON
Working with HTTP
Getting to grips with APIs
Working with REST
Working with JSON
Let’s have some fun – who is on the International Space Station?
Summary
Exercises
Further reading
9
Part 2: Scripting and Toolmaking
Part 2: Scripting and Toolmaking
10
Chapter 8: Writing Our First Script – Turning Simple Cmdlets into Reusable Code
Chapter 8: Writing Our First Script – Turning Simple Cmdlets into Reusable Code
Introduction to scripting
Writing a script
Identifying changing values
Working with parameters
Providing help for our script
Summary
Further reading
Exercises
11
Chapter 9: Don’t Repeat Yourself – Functions and Scriptblocks
Chapter 9: Don’t Repeat Yourself – Functions and Scriptblocks
Why do we care about repeating code?
How to turn repeating code into a function
The concept of scope
Exploring scriptblocks
Let’s do something useful
Summary
Further reading
Exercises
12
Chapter 10: Error Handling – Oh No! It’s Gone Wrong!
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Chapter 10: Error Handling – Oh No! It’s Gone Wrong!
What is an error?
Understanding error actions
Catching errors
Exploring debugging
Debugging with VS Code
Summary
Exercises
Further reading
13
Chapter 11: Creating Our First Module
Chapter 11: Creating Our First Module
Working with modules
Writing a simple module
Module manifests
Using scaffolding tools such as Plaster
Summary
Exercises
Further reading
14
Chapter 12: Securing PowerShell
Chapter 12: Securing PowerShell
Why is security so important?
Securing PowerShell against inadvertent mistakes
Running PowerShell securely
PowerShell logging
Writing secure code
Summary
Exercises
Further reading
15
Part 3: Using PowerShell
Part 3: Using PowerShell
16
Chapter 13: Working with PowerShell 7 and Windows
Chapter 13: Working with PowerShell 7 and Windows
Understanding PowerShell 7 and Windows PowerShell
Exploring compatibility
What doesn’t work with PowerShell 7
Managing machines with CIM and WMI
Summary
Exercises
Further reading
17
Chapter 14: PowerShell 7 for Linux and macOS
Chapter 14: PowerShell 7 for Linux and macOS
Technical requirements
Installing PowerShell 7
Installing VS Code
Running PowerShell on Linux
Remoting with OpenSSH
PowerShell for macOS
Summary
Exercises
Further reading
18
Chapter 15: PowerShell 7 and the Raspberry Pi
Chapter 15: PowerShell 7 and the Raspberry Pi
Technical requirements
Introduction to the Raspberry Pi
Installing PowerShell 7 and VS Code
Connecting remotely to the Pi
Running PowerShell on Raspberry Pi OS
Simple physical computing
Summary
Questions
Further reading
19
Chapter 16: Working with PowerShell and .NET
Chapter 16: Working with PowerShell and .NET
Exploring .NET
The components of .NET
Working with .NET in PowerShell
Using .NET
Summary
Exercises
Further reading
20
Answers to Activities and Exercises
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
21
Index
Index
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22
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Catching errors

As we’ve discovered, errors contain lots of useful information we can use to make our code run smoothly. While Get-Error and the $Error variable are useful for real-time troubleshooting, we need to have another way to deal with errors when we are writing scripts.

Try/Catch/Finally

The best way to handle terminating errors in PowerShell is with a Try/Catch/Finally statement. This statement allows us to set up alternate courses of action, depending on whether or not an error occurred. The statement consists of a mandatory Try block, which contains code that might generate an error, and then either a Catch block, a Finally block, or both. The Catch block will run if the code in the Try block generates a terminating error; this is our exception handler. The code in the Finally block will run regardless of whether an error is generated or not; this block is used for any code that may be required to clean up after the code in the Try block. We don’t see...

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