Book Image

Mastering Windows PowerShell Scripting (Second Edition) - Second Edition

By : Brenton J.W. Blawat
Book Image

Mastering Windows PowerShell Scripting (Second Edition) - Second Edition

By: Brenton J.W. Blawat

Overview of this book

PowerShell scripts offer a handy way to automate various chores. Working with these scripts effectively can be a difficult task. This comprehensive guide starts from scratch and covers advanced-level topics to make you a PowerShell expert. The first module, PowerShell Fundamentals, begins with new features, installing PowerShell on Linux, working with parameters and objects, and also how you can work with .NET classes from within PowerShell. In the next module, you’ll see how to efficiently manage large amounts of data and interact with other services using PowerShell. You’ll be able to make the most of PowerShell’s powerful automation feature, where you will have different methods to parse and manipulate data, regular expressions, and WMI. After automation, you will enter the Extending PowerShell module, which covers topics such as asynchronous processing and, creating modules. The final step is to secure your PowerShell, so you will land in the last module, Securing and Debugging PowerShell, which covers PowerShell execution policies, error handling techniques, and testing. By the end of the book, you will be an expert in using the PowerShell language.
Table of Contents (24 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Date and time manipulation


DateTime objects may be created in a number of ways. The Get-Date command is one of these. The methods on the DateTime type has a number of static methods that might be used, and an instance of DateTime has methods that might be used.

DateTime parameters

While most commands deal with dates in a culture-specific format, care must be taken when passing dates (as strings) to parameters that cast to DateTime.

Casting to DateTime does not account for a cultural bias. For example, in the UK the format dd/MM/yyyy is often used. Casting this format to DateTime will switch the format to MM/dd/yyyy (as used in the US):

$string = "11/10/2000"    # 11th October 2000 
[DateTime]$string         # 10th November 2000

If a function is created accepting a DateTime as a parameter, the result may not be as expected:

function Test-DateTime { 
    param( 
        [DateTime]$Date 
    ) 
    $Date 
} 
Test-DateTime -Date "11/10/2000" 

It is possible to work around this problem using the Get...