Book Image

PowerShell for Office 365

By : Martin Machado
Book Image

PowerShell for Office 365

By: Martin Machado

Overview of this book

While most common administrative tasks are available via the Office 365 admin center, many IT professionals are unaware of the real power that is available to them below the surface. This book aims to educate readers on how learning PowerShell for Offi ce 365 can simplify repetitive and complex administrative tasks, and enable greater control than is available on the surface. The book starts by teaching readers how to access Offi ce 365 through PowerShell and then explains the PowerShell fundamentals required for automating Offi ce 365 tasks. You will then walk through common administrative cmdlets to manage accounts, licensing, and other scenarios such as automating the importing of multiple users,assigning licenses in Office 365, distribution groups, passwords, and so on. Using practical examples, you will learn to enhance your current functionality by working with Exchange Online, and SharePoint Online using PowerShell. Finally, the book will help you effectively manage complex and repetitive tasks (such as license and account management) and build productive reports. By the end of the book, you will have automated major repetitive tasks in Office 365 using PowerShell.
Table of Contents (16 chapters)
Title Page
About the Authors
About the Reviewer
Customer Feedback

Using the if and where statements

When writing scripts, we have to implement business logic that will shape the process. The if and where statements allow us to define logical conditions. For example, if you would like to compare two numbers, you can use the if and else statements and, based on the comparison, take appropriate action.

Conditional statements are the building blocks of any programming and scripting language.

If a certain condition is true, we can run a block of code. The syntax of an if...else is as follows:

if (<test1>)  
  {<statement list 1>} 
elseif (<test2>) 
  {<statement list 2>} 
  {<statement list 3>}

Here's an example:

$a = 6;
 if( $a -eq 5){
   Write-Host "Variable a is equal to 5"
 elseif( $a -eq 4){
   Write-Host "Variable a is equal to 4"
   Write-host "Variable a is not equal to 5 and 4"

The output of this script will be Variable a is not equal to 5 and 4.

We can use a combination of the if...else statements where in the if block we check for a condition: if that condition is true, then we execute a block of code, and if the condition is not true, then we execute another block of code. Sometimes, we can have more than one expected outcome and we can use multiple elseif conditions. The comparison operator -eq returns Boolean values (true or false). If the outcome of the comparison is true, then the associated block of code is executed. Since it is a Boolean value, we can use the reverse logic as well.

We have a lot of comparison operators available in PowerShell:

  • -eq: Equal to
  • -ne: Not equal to
  • -gt: Greater than
  • -ge: Greater than or equal to
  • -lt: Less than
  • -le: Less than or equal to
  • -like: Wildcard match
  • -notlike: Does not match wildcard
  • -match: Regular expression matching
  • -notmatch: Does not match regular expression pattern
  • -contains: Collection contains item
  • -notcontains: Collection does not contain item
  • -in: Item is in a collection

We can use multiple comparison operators in a single if statement. This helps you implement complex scenarios.

You can have multiple if statements or even use nested if statements.

We can Where-Object cmdlet to filter data return by other cmdlets. For example, if we would like to find out the processes running on a computer with the name svcHost we can use the Where-Object cmdlet with the Get-Process cmdlets as shown below.

Get-Process | Where-Object {$ -contains "svcHost"}