param( 
	[Parameter(Mandatory=$true)]
    [string]$url
)

function Write-Log($msg) {
    Write-Host $msg -foregroundcolor green
    ($msg) | Out-File "log.txt" -Append
}

function Process-List($list) {
	if ($list.BaseTemplate -ne "DocumentLibrary") {
		return
	}
	Write-Log ("  " + $list.Title)
	$list.ForceCheckout = $false
	$list.Update()
}

function Process-Web($web) {
	Write-Log ($web.Url)
	$web.Lists | ForEach-Object { Process-List $_ }
}

function Proces-Site($site) {
	$site.AllWebs | ForEach-Object { Process-Web $_ }
}

$webApp = Get-SPWebApplication $url
$webApp.Sites | ForEach-Object { Proces-Site $_ }