Sharepoint 2010: Hide ContentType Field using Powershell script

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Hide List ContentType Field using Powershell script
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$siteUrl = "http://servername/sites/P128023/"

[system.reflection.assembly]::LoadWithPartialName("Microsoft.Sharepoint") > $null

$site = New-Object Microsoft.SharePoint.SPSite($siteUrl)

$RootWeb = $site.RootWeb

$lookForList ="Events"

$EventsList= $RootWeb.Lists[$lookForList]

if ($EventsList -ne $null)

    {

        $MissionContentType = $EventsList.ContentTypes["Mission"]

            $field = $MissionContentType.FieldLinks["Category"]

            $field.Hidden = $true

            $MissionContentType.Update();

            $EventsList.Update()

}

if ($site) {$site.Dispose()}

if ($RootWeb){ $RootWeb.Dispose()}


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Hide ContentType Field using Powershell script
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$siteUrl = "http://spdev5:8002/sites/library/"

[system.reflection.assembly]::LoadWithPartialName("Microsoft.Sharepoint") > $null

$site = New-Object Microsoft.SharePoint.SPSite($siteUrl)

$RootWeb = $site.RootWeb

$MyContentType=$RootWeb.ContentTypes["CV"]

$MyField=$MyContentType.Fields["SAIC DOC"]

$MyContentType.FieldLinks[$MyField.Id].Hidden =$true

$MyContentType.Update($true)

write-host "updated" $field.type

if ($site) {$site.Dispose()}

if ($RootWeb){ $RootWeb.Dispose()}