PowerShell to delete FieldLinks for List Content Type in SP 2013

Question

Want to know how to delete the fieldlinks for the content type.

        Write-Host "Deleted Redundant ACL Columns from List " $list " for 
         web " $web.title

        $sitecols = @{"BU" = "BU"; "Discipline" = "Discipline";}

        $cttypes = @("Memo","Model")

        foreach ($cttype in $cttypes)
        {
            $cttypeo = $list.contenttypes[$cttype]

            $cttypeo.FieldLinks.delete($fieldbuLink.Id)
            $cttypeo.FieldLinks.delete($fielddisciplineLink.Id)
        } 

I am trying to apply the above code for deleting the List Content Type association for my Document Library.But somehow its not working.What I am missing here? After executing this script I am still able to see the list content type association still exists!

Answer 1

You should update your content type using $cttype.Update() in your foreach sequense after field link deletion