Upload file to a sharepoint doc library via powershell

uploadfile.ps1

$siteUrl = "http://sharepoint/"
$listName = "Site Assets"

$fileName = "OfferApp.xap"
$filePath = "OfferApp.Web\ClientBin\" + $fileName

[system.reflection.assembly]::LoadWithPartialName("Microsoft.Sharepoint")
$site = New-Object Microsoft.SharePoint.SPSite($siteUrl)
$web = $site.OpenWeb()

$list = $web.Lists[$listName]

$fileCollection = $list.RootFolder.Files

$file = Get-Item $filePath
$stream = $file.OpenRead()
$uploaded = $fileCollection.Add($file.Name, $stream, $TRUE)
"Uploaded " + $file.Name
if ($stream) {$stream.Dispose()}

#$files = get-childItem -Exclude *.ps1
#foreach ($file in $files)
#{
#    $stream = $file.OpenRead()
#    $uploaded = $fileCollection.Add($file.Name, $stream, $TRUE)
#    "Uploaded " + $file.Name
#    if ($stream) {$stream.Dispose()}
#}

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