3. Comparison Operators | Mastering Windows PowerShell Scripting

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Table Of Contents

Mastering Windows PowerShell Scripting

By : Brenton J.W. Blawat

4.4 (16)

Mastering Windows PowerShell Scripting

4.4 (16)

By: Brenton J.W. Blawat

Overview of this book

If you are a system administrator who wants to become an expert in controlling and automating your Windows environment, then this book is for you. Prior knowledge of PowerShell's core elements and applications is required for this book.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Variables, Arrays, and Hashes

1. Variables, Arrays, and Hashes

Variables

Arrays

Hashes

Deciding the best container for your scripts

Summary

2. Data Parsing and Manipulation

2. Data Parsing and Manipulation

String manipulation

Number manipulation and parsing

Date and time manipulation

Forcing data types

Piping variables

Summary

3. Comparison Operators

3. Comparison Operators

Comparison operator basics

Equal and not equal comparison

Greater than and less than comparison

Contains, like, and match operators

And / OR comparison operators

Best practices for comparison operators

Summary

4. Functions, Switches, and Loops Structures

4. Functions, Switches, and Loops Structures

Functions

Looping structures

Switches

Combining the use of functions, switches, and loops

Best practices for functions, switches, and loops

Summary

5. Regular Expressions

5. Regular Expressions

Getting started with regular expressions

Regular expression grouping constructs and ranges

Regular expression quantifiers

Regular expression anchors

Regular expressions examples

Summary

6. Error and Exception Handling and Testing Code

6. Error and Exception Handling and Testing Code

Error and exception handling – parameters

Error and exception handling – Try/Catch

Error and exception handling – legacy exception handling

Methodologies for testing code

Summary

7. Session-based Remote Management

7. Session-based Remote Management

Utilizing CIM sessions

Summary

8. Managing Files, Folders, and Registry Items

8. Managing Files, Folders, and Registry Items

Registry provider

Creating files, folders, and registry items with PowerShell

Adding named values to registry keys

Verifying files, folders, and registry items

Copying and moving files and folders

Renaming files, folders, registry keys, and named values

Deleting files, folders, registry keys, and named values

Summary

9. File, Folder, and Registry Attributes, ACLs, and Properties

9. File, Folder, and Registry Attributes, ACLs, and Properties

Retrieving attributes and properties

Viewing file and folder extended attributes

Setting the mode and extended file and folder attributes

Managing file, folder, and registry permissions

Summary

10. Windows Management Instrumentation

10. Windows Management Instrumentation

WMI structure

Using WMI objects

Searching for WMI classes

Creating, modifying, and removing WMI property instances

Invoking WMI class methods

Summary

11. XML Manipulation

11. XML Manipulation

XML file structure

Summary

12. Managing Microsoft Systems with PowerShell

12. Managing Microsoft Systems with PowerShell

Managing local users and groups

Managing Windows services

Managing Windows processes

Installing Windows features and roles

Summary

13. Automation of the Environment

13. Automation of the Environment

Invoking programs for automation

Using desired state configuration

Detecting and restoring drifting configurations

Summary

14. Script Creation Best Practices and Conclusion

14. Script Creation Best Practices and Conclusion

Best practices for script management

# commenting headers

Best practices for script creation

Best practices for software automation

Summary

Index

Index

Greater than and less than comparison

PowerShell has two operators to compare two values to determine whether they are greater than (–gt) or less than (-lt) each other. This is not just limited to numbers, but also has the ability to compare dates and times as well. These are helpful in instances where you need to compare file sizes or modification dates on files.

A script that shows how to use the "less than" comparison operator would look like this:

$number1 = 10
$number2 = 20
If ($number1 –lt $number2) { Write-Host "Value $number1 is less than $number2" }

The output of this command is shown in the following screenshot:

In the preceding example, you set the $number1 variable to 10 and the $number2 variable to 20. You then use the "less than" (–lt) operator to determine whether the $number1 variable is less than $number2. Since this a true statement, the console outputs the message Value $number1 is less than $number2.

A script that shows how to use the "greater than" comparison operator would...

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