I was trying to do some bulk upload Test using Powershell and found the below link to pre-populate SharePoint with some Test Data.  I tried to make it work but there were few bugs. The actual script writtne by ArianNevjestic is still available at http://blogs.technet.com/b/anevjes/archive/2010/03/01/sharepoint-2010-pre-population-powershell-script.aspx

Note that this is not my Script.  I have made some changes and putting the updated one here.

Set-ExecutionPolicy Unrestricted

#USER Defined Variables

$siteCollTemplate = “STS#0″
$webAppProtocol =”http://”
$WebAppsToCreate = @(“extranet.contoso.com:80″,”www.contoso.com:80“)
$numSiteCollectionsPerWebApp =5
$OwnerAlias = “contoso\sp_admin”
$docLib = “AnalyticsReports”
$fileSource = “C:\Users\sp_admin\Desktop\UploadFiles”
$appPoolExt = “App_Pool”
# DO not edit anything beyond this line

function SPContentUpload {

#my document upload function to a sharepoint doc library.

param ([string]$urlDocLib,[string]$urlSPWeb,[string]$strDirPath)

$hshDocProps=@{“ContentType”=”Document“}
[void][System.Reflection.Assembly]::LoadWithPartialName(”Microsoft.SharePoint”)
$SPsite=new-object Microsoft.SharePoint.SPSite($urlDocLib)
$SPweb=$SPsite.openweb($urlSPWeb)

#loop through all the files in the source folder and add each file to the defined SharePoint doc library

dir $strDirPath | foreach-object {
               $bytes=get-content $_.fullname -encoding byte
               $arrbytes=[byte[]]$bytes
               $SPWeb.files.Add($($urlDocLib +$docLib) + “/” + $_.Name + [guid]::newGuid().tostring(),$arrbytes,$hshDocProps, $true)
 

}

$SPSite.Dispose()

}

#[guid]::newGuid().tostring()
$b=1

foreach ($webApp in $WebAppsToCreate) {
$Split=$webApp.split(“:”)
$webAppUrl=$Split[0]
$webAppPort =$Split[1]

Write-Host Web App Url $webAppUrl $webAppPort
$webAppUrlFull=”$webAppProtocol$webAppUrl”

$OwnerMA = Get-SPManagedAccount -Identity “Contoso\sp_admin”
New-SPWebApplication -Name $($webAppUrl + ” Web Application” + $b) –URL $webAppUrlFull -port $webAppPort -ApplicationPool “$($webAppUrl + “_app_Pool” + $b)” -ApplicationPoolAccount $OwnerAlias -DatabaseName $($webAppUrl + “_” + $webAppPort) -HostHeader $webAppUrl

Write-Host Web App Url $webAppUrlFull

#Create new content db

#New-SPContentDatabase $webAppUrl -WebApplication $webAppUrlFull
New-SPContentDatabase $($webAppUrl + “_” + $webAppPort + “_2”) -WebApplication $($webAppUrlFull + “:” + $webAppPort)

$b++

$fileSource = “C:\Users\sp_admin\Desktop\UploadFiles”
$i=1

do {
$siteCollPath = $($webAppUrlFull + “:” + $webAppPort + “/sites/” + $i)
$siteCollPath2 = $($webAppUrlFull + “:” + $webAppPort + “/sites/” + $i + “_”)

Write-Host Creating site collection $siteCollPath

#create site collection to go to unique content database
New-SPSite -url $siteCollPath -OwnerAlias $OwnerAlias -Name “Test Wiki content db_1_ $i” -Template $siteCollTemplate -ContentDatabase $($webAppUrl + “_” + $webAppPort)
#populate Doc lib for above site collection
SPContentUpload “$($webAppUrlFull + “:” + $webAppPort + “/sites/” + $i + “/”)” “” “$fileSource”
#create site collection to go to sep content database
New-SPSite -url $siteCollPath2 -OwnerAlias $OwnerAlias -Name “Test Wiki content db_2_$i” -Template $siteCollTemplate -ContentDatabase $($webAppUrl + “_” + $webAppPort + “_2”)

#populate Doc lib for above site collection
SPContentUpload “$($webAppUrlFull + “:” + $webAppPort + “/sites/” + $i + “_/”)” “” “$fileSource”

$i++
}
while ($i -le $numSiteCollectionsPerWebApp)
}

Couple of Tips: Make sure that you have access to your Source file Folder.   If UAC is on you will not have access to C Drive.

Do not copy paste the script from you PC to HyperV VM using write clipboard text.  Seems Like some words were replaced by special characters.