SharePoint 2010, Powershell - Loop through all Document Libraries, create view and set it as default
$site= New-Object Microsoft.SharePoint.SPSite $siteURL
$web=$site.OpenWeb()
$list=$web.Lists["$list"]
$view=$list.Views["Detailed"]
$view.DefaultView = $true
$view.Update()
$list.Update()

Add-PSSnapin Microsoft.SharePoint.PowerShell -erroraction SilentlyContinue
$siteURL = "http://sp14fdev01/"
$site = Get-SPSite($siteURL)

foreach($web in $site.AllWebs) {
foreach($list in $web.Lists) {
        if($list.BaseType -eq "DocumentLibrary") {

 $site = New-Object Microsoft.SharePoint.SPSite($SiteURL) ;
 $web = $site.OpenWeb($SiteURL);
 $list = $web.Lists.item($listname);

 $viewfields = New-Object System.Collections.Specialized.StringCollection
 $viewfields.Add("DocIcon")
 $viewfields.Add("LinkFilename")
 $viewfields.Add("_UIVersionString")
 $viewfields.Add("FileSizeDisplay")
 $viewfields.Add("Created")
 $viewfields.Add("Modified")
 $viewfields.Add("Editor")
 [void]$list.Views.Add("Detailed", $viewfields, "", 100, $true, $true)

 $list.Update();
 }}
 $web.Dispose();
 $site.Dispose();
 }

Add-PSSnapin Microsoft.SharePoint.PowerShell -erroraction SilentlyContinue

$siteURL = "http://sp14fdev01/"
$site = Get-SPSite($siteURL)

foreach($web in $site.AllWebs) {
  foreach($list in $web.Lists) {
    if($list.BaseType -eq "DocumentLibrary") {
// the variables `$web` and `$list` already reference the objects you need
      //$site = New-Object Microsoft.SharePoint.SPSite($SiteURL) ;
      //$web = $site.OpenWeb($SiteURL);

// new instance of the list is necessary to avoid the error "Collection was modified"
      $newList = $web.Lists.item($list.ID);

      $viewfields = New-Object System.Collections.Specialized.StringCollection
      $viewfields.Add("DocIcon")
      $viewfields.Add("LinkFilename")
      $viewfields.Add("_UIVersionString")
      $viewfields.Add("FileSizeDisplay")
      $viewfields.Add("Created")
      $viewfields.Add("Modified")
      $viewfields.Add("Editor")
      [void]$newList.Views.Add("Detailed", $viewfields, "", 100, $true, $true)

      $newList.Update();

// setting the default view
      $view=$newList.Views["Detailed"]
      $view.DefaultView = $true
      $view.Update()
    }
  }

  $web.Dispose();
}

$site.Dispose();