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Mastering Windows PowerShell Scripting (Second Edition)

You're reading from   Mastering Windows PowerShell Scripting (Second Edition) One-stop guide to automating administrative tasks

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Product type Paperback
Published in Oct 2017
Publisher Packt
ISBN-13 9781787126305
Length 440 pages
Edition 2nd Edition
Languages
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Author (1):
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Chris Dent Chris Dent
Author Profile Icon Chris Dent
Chris Dent
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Table of Contents (18) Chapters Close

Preface 1. Introduction to PowerShell FREE CHAPTER 2. Working with PowerShell 3. Modules and Snap-Ins 4. Working with Objects in PowerShell 5. Operators 6. Variables, Arrays, and Hashtables 7. Branching and Looping 8. Working with .NET 9. Data Parsing and Manipulation 10. Regular Expressions 11. Files, Folders, and the Registry 12. Windows Management Instrumentation 13. HTML, XML, and JSON 14. Working with REST and SOAP 15. Remoting and Remote Management 16. Testing 17. Error Handling

Comparison operators


PowerShell has a wide variety of comparison operators:

  • Equal to and not equal to: -eq and -ne
  • Like and not like: -like and -notlike
  • Greater than and greater than or equal to: -gt and -ge
  • Less than and less than or equal to: -lt and -le
  • Contains and not contains: -contains and -notcontains
  • In and not in: -in and -notin

Case-sensitivity

None of the comparison operators are case sensitive by default. Each of the comparison operators has two additional variants, one which explicitly states it is case-sensitive, and another which explicitly states it is case-insensitive.

For example, the following statement returns true:

'Trees' -eq 'trees' 

Adding a c modifier in front of the operator name forces PowerShell to make a case-sensitive comparison. The following statement will return false:

'Trees' -ceq 'trees' 

In addition to this the case-sensitive modifier, PowerShell also has an explicit case-insensitive modifier:

'Trees' -ieq 'trees' 

However, as case insensitive comparison is the default...

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