SharePoint Online: PowerShell script to Remove a defined column accross the Site collection

Our large SharePoint Online Site collection used for Intranet Corporate Portal based on Publishing site, we have a large number of subsites into.

We had to remove a field place into the page library of all those subsites.

The following script was built to do that removal.

You can adapt it as you want for your own requirements.

[string]$username = "Admin@yourtenant.onmicrosoft.com"
[string]$PwdTXTPath = "C:\SECUREDPWD\ExportedPWD-$($username).txt"
$secureStringPwd = ConvertTo-SecureString -string (Get-Content $PwdTXTPath)
$adminCreds = New-Object System.Management.Automation.PSCredential $username, $secureStringPwd

[string]$RootSiteToCheck = "https://yourtenant.sharepoint.com/sites/YourSiteCollection"
[string]$SPListToCheck = "Pages"
[string]$SPFieldInternalNameToCheck = "PublishedDate"

function Load-DLLandAssemblies
{
	[string]$defaultDLLPath = ""
	# Load assemblies to PowerShell session 
	$defaultDLLPath = "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.SharePoint.Client.dll"
	[System.Reflection.Assembly]::LoadFile($defaultDLLPath)
	$defaultDLLPath = "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.SharePoint.Client.Runtime.dll"
	[System.Reflection.Assembly]::LoadFile($defaultDLLPath)
	$defaultDLLPath = "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.Online.SharePoint.Client.Tenant.dll"
	[System.Reflection.Assembly]::LoadFile($defaultDLLPath)
}

function Check-And-Fix-Field-In-SPList ([Microsoft.SharePoint.Client.ClientContext]$Context, [Microsoft.SharePoint.Client.Web]$CurrentWeb)
{
	$MyCurrentListTocheck = $CurrentWeb.Lists.GetByTitle($SPListToCheck)
	$AllSPListCT = $MyCurrentListTocheck.ContentTypes
	$Context.Load($MyCurrentListTocheck)
	$Context.Load($AllSPListCT)
	$Context.ExecuteQuery()
	Write-Host "  ===>>> SubSite to check:", $CurrentWeb.Title, "- URL:", $CurrentWeb.Url -ForegroundColor Green
	Write-Host "  ===>>> List to check:", $MyCurrentListTocheck.Title -ForegroundColor Green
	foreach($MySpListCT in $AllSPListCT)
	{
		Write-Host "         -->> Content Type Name:", $MySpListCT.Name
		Write-Host "         -->> Content Type ID:", $MySpListCT.id
		$Myfields = $MySpListCT.Fields
		$Context.Load($Myfields)
		$Context.ExecuteQuery()
		$MyfieldToCheck = ($Myfields | where {$_.InternalName -eq $SPFieldInternalNameToCheck})
		if($MyfieldToCheck -ne $null)
		{
			Write-Host "             ---------------------------------------------- " -ForegroundColor Yellow
			Write-Host "             >>>> Field Name:", $MyfieldToCheck.Title -ForegroundColor Yellow
			Write-Host "             >>>> Field InternalName:", $MyfieldToCheck.InternalName, "- Field ID:", $MyfieldToCheck.id -ForegroundColor Yellow
			Write-Host "             >>>> Field Required:", $MyfieldToCheck.Required -ForegroundColor Yellow
			Write-Host "             ---------------------------------------------- " -ForegroundColor Yellow
			$MyfieldToCheck.DeleteObject();
			$MySpListCT.Update($false);
			$Context.Load($MySpListCT);
			$Context.ExecuteQuery()
			Write-Host "             >>>> Field Deleted !!!!" -ForegroundColor Red
		}
	}
}

function Get-SPOSubWebs
{
	Param( 
        [Microsoft.SharePoint.Client.ClientContext]$Context, 
        [Microsoft.SharePoint.Client.Web]$RootWeb
    ) 
	$Webs = $RootWeb.Webs
	$Context.Load($Webs)
	$Context.ExecuteQuery()
	ForEach ($sWeb in $Webs)
	{
		Write-host "   ====>> SubSite:", $sWeb.URL -ForegroundColor red
		Check-And-Fix-Field-In-SPList $Context $sWeb
		Get-SPOSubWebs -RootWeb $sWeb -Context $Context
	} 
} 

cls
Write-Host " ---------------------------------------------- "
Load-DLLandAssemblies
Write-Host " ---------------------------------------------- "
Write-host "===================================================================================================" -ForegroundColor Green
$mySitectx = New-Object Microsoft.SharePoint.Client.ClientContext($RootSiteToCheck)
$mySitectx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($adminCreds.UserName, $adminCreds.Password)
$mySitectx.RequestTimeout = 1000000 # milliseconds
$myCurrentWeb = $mySitectx.Web
$mySitectx.Load($myCurrentWeb)
$mySitectx.ExecuteQuery()
Write-Host " "
Write-Host " ---------------------------------------------------------"
Write-Host "  >>>> # Server Version:" $mySitectx.ServerVersion " # <<<<<<" -ForegroundColor Green 
Write-Host " ---------------------------------------------------------"
Write-Host " "
Write-host "==================================================================================================="
Write-host "   -->> RootSite:", $myCurrentWeb.URL -ForegroundColor green
Write-host "==================================================================================================="
Check-And-Fix-Field-In-SPList $mySitectx $myCurrentWeb
Get-SPOSubWebs $mySitectx $myCurrentWeb
Write-host "==================================================================================================="

Fabrice Romelard

French version: