Create Update-SharePoint-SiteLogos.ps1

Office365-Sharepoint/Update-SharePoint-SiteLogos.ps1

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+<#
+.SYNOPSIS
+   Update the root site and subsites to the logo specified
+.DESCRIPTION
+    Creds supplied will need to be a site wonerr for all sites
+.INPUTS
+    [String] $SiteUrl (Root site to Process)
+    [String] $LogoURL (Logo Path to Set)
+.NOTES
+    File Name      : Update-SharePointSiteLogos.ps1
+    Author         : Andrew Badge
+    Prerequisite   : Powershell 5.1
+    Thanks and Reference: https://www.sharepointdiary.com/2016/11/sharepoint-online-how-to-change-logo-using-powershell.html
+#>
+
+#Add PowerShell Module for SharePoint Online
+Import-Module Microsoft.Online.SharePoint.Powershell -DisableNameChecking
+
+##Configuration variables. Change these to suit
+$SiteUrl = "https://orgname.sharepoint.com/sites/sitename"
+$LogoURL="/sites/sitename/Style Library/Logos/Logo.png"
+
+$Cred = Get-Credential
+$Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
+
+
+Try {
+
+    #Setup the context
+    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
+    $Ctx.Credentials = $Credentials
+
+    #Get the Root web
+    $Web = $Ctx.Web
+    $Ctx.Load($Web)
+    $Ctx.ExecuteQuery()
+
+    #Function to change Logo for the given web
+    Function Update-Logo($Web)
+    {
+        try {
+            #Update Logo
+            $Web.SiteLogoUrl = $LogoURL
+            $Web.Update()
+            $Ctx.ExecuteQuery()
+            Write-host "Updated Logo for Web:" $Web.URL
+
+            #Process each subsite in the site
+            $Subsites = $Web.Webs
+            $Ctx.Load($Subsites)
+            $Ctx.ExecuteQuery()        
+            Foreach ($SubSite in $Subsites)
+            {
+                #Call the function Recursively
+                Update-Logo($Subsite)
+            }
+        }
+        Catch {
+            write-host -f Red "Error updating Logo for " $Web.URL $_.Exception.Message
+        }
+    }
+
+    #Call the function to change the logo of the web
+    Update-Logo($Web)
+}
+Catch {
+    write-host -f Red "Error updating Logo!" $_.Exception.Message
+}