SharePoint 2010 PowerShell Help – Applying Master Pages and CSS

Hey all, i’m looking for some scripting help.

Basically what I am trying to do is get all Site Collections under a specific Web Application, then apply the properties for MasterUrl, CustomMasterUrl and AlternateCssUrl.

Here is the script I have, which is not working as it tells me ‘The Properties do not exist’:

Get-SPSite -ContentDatabase SP_CONTENT | foreach-object {
$_.MasterUrl = “/_catalogs/masterpage/cs1_sp2010.master”
$_.CustomMasterUrl = “/_catalogs/masterpage/cs1_sp2010.master”
$_.alternatecssurl = “/Style Library/cs1_sp2010.css”;
$_.Update()
}

When executing Get-SPSite -ContentDatabase SP_CONTENT, I receive the list of site collections (which is approximately 15 in this case). Results of the Get statement below:

Url
—

http://web.site.com
http://web.site.com/app/branding
http://web.site.com/app/bree
http://web.site.com/app/carrepairs
http://web.site.com/app/invoicing
http://web.site.com/app/sctrack
http://web.site.com/dept/Equip
http://web.site.com/dept/Finance
http://web.site.com/dept/FM
http://web.site.com/dept/HR
http://web.site.com/dept/IT
http://web.site.com/dept/it/pmo
http://web.site.com/dept/Laws
http://web.site.com/dept/QA
http://web.site.com/dept/QITS
http://web.site.com/dept/SRStuff

When executing the full PowerShell script in blue above, here are the errors received:

Property ‘MasterUrl’ cannot be found on this object; make sure it exists and is
settable.
At E:\scripts\Branding\Branding-AAA-TEST-Apply_MasterPages_CSS_to_INSIDEQA_Site
s.ps1:2 char:8
+ $_. <<<< MasterUrl = “/_catalogs/masterpage/cs1_sp2010.master”
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : PropertyAssignmentException

Property ‘CustomMasterUrl’ cannot be found on this object; make sure it exists
and is settable.
At E:\scripts\Branding\Branding-AAA-TEST-Apply_MasterPages_CSS_to_INSIDEQA_Site
s.ps1:3 char:8
+ $_. <<<< CustomMasterUrl = “/_catalogs/masterpage/cs1_sp2010.master”
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : PropertyAssignmentException

Property ‘alternatecssurl’ cannot be found on this object; make sure it exists
and is settable.
At E:\scripts\Branding\Branding-AAA-TEST-Apply_MasterPages_CSS_to_INSIDEQA_Site
s.ps1:4 char:8
+ $_. <<<< alternatecssurl = “/Style Library/cs1_sp2010.css”;
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : PropertyAssignmentException

Method invocation failed because [Microsoft.SharePoint.SPSite] doesn’t contain
a method named ‘Update’.
At E:\scripts\Branding\Branding-AAA-TEST-Apply_MasterPages_CSS_to_INSIDEQA_Site
s.ps1:5 char:14
+ $_.Update <<<< ()
+ CategoryInfo : InvalidOperation: (Update:String) [], RuntimeExc
eption
+ FullyQualifiedErrorId : MethodNotFound

Any help is appreciated, thanks!