Need help writing script to change version control for all document libraries in all sites

Question

Hello,
I found this script, http://get-spscripts.com/2010/10/changing-sharepoint-list-settings-using.html that
changes versions control for a document library.  However, many sites have many document libraries with different names.  The script below just changes a the settings to a document library that is named "Shared Documents", but does not
change one if its named something else.  How can change the script to loop through all document libraries so their settings are changed?
$site = Get-SPSite http://site
$listName = "Shared Documents"
#Walk through each site in the site collection
$site | Get-SPWeb | 
ForEach-Object {
#Get the list in this site
$list = $_.Lists[$listName]
#Create a version each time you edit an item in this list (lists)
#Create major versions (document libraries)
$list.EnableVersioning = $true
#Create major and minor (draft) versions (document libraries only)
$list.EnableMinorVersions = $true
#Keep the following number of versions (lists)
#Keep the following number of major versions (document libraries)
$list.MajorVersionLimit = 7
#Keep drafts for the following number of approved versions (lists)
#Keep drafts for the following number of major versions (document libraries)
$list.MajorWithMinorVersionsLimit = 5
#Update the list
$list.Update()
#Dispose of the site object
$site.Dispose()
Paul

Answer 1

Sorry, I agree. It will update Style Library and other out of the box ones. Include the library titles in a collection and run the update against them provided these libraries are common across all sites. If not, you will have to first get an extract of
all such libraries in all sites say in a CSV file and then update the script below to refer to the CSV records.
Add-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction Stop;
#List of Libraries to be updated.
$Libraries = @("Shared Documents","My Document Library");
$spAssgn = Start-SPAssignment;
$site = Get-SPSite http://site -AssignmentCollection $spAssgn
#Walk through each site in the site collection
$site | Get-SPWeb -Limit ALL -AssignmentCollection $spAssgn |
ForEach-Object {
#Enumerate through all document libraries
$_.Lists|Where{$_.BaseTemplate -eq "DocumentLibrary" -and $Libraries -contains $_.Title}|Foreach-Object{
#Get the list in this site
$list = $_;
#Create a version each time you edit an item in this list (lists)
#Create major versions (document libraries)
$list.EnableVersioning = $true
#Create major and minor (draft) versions (document libraries only)
$list.EnableMinorVersions = $true
#Keep the following number of versions (lists)
#Keep the following number of major versions (document libraries)
$list.MajorVersionLimit = 7
#Keep drafts for the following number of approved versions (lists)
#Keep drafts for the following number of major versions (document libraries)
$list.MajorWithMinorVersionsLimit = 5
#Update the list
$list.Update()
Stop-SPAssignment $spAssgn;
This post is my own opinion and does not necessarily reflect the opinion or view of Slalom.