Add SharePoint Security Group to All Lists or Libraries in a Site using PowerShell

This is sometimes very hectic for admins to add a new SharePoint Security group to a number of Lists and Libraries.

Using below code, it will be very easy to add a security group to all lists and libraries.

If you want to add security group to a specific type of library, you can add filter like the one below

if($spList.BaseTemplate -eq "10002")

For the information about base template follow the link

https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.client.listtemplatetype.aspx

# Get Site

$spSite = Get-SPSite http://siteurl

# Get all web in current site

$spWebs = $spSite.AllWebs

# Set Permission level in variable

$PermissionLevel = "Read"

# Loop All Webs in site

foreach($web in $spWebs)

{

    # Get the Site Group from current Web which you want to add in Permissions for List/Library

       $spGroup = $web.SiteGroups["Visitors"]

    # Loop through all the lists/Libraries

       foreach($spList in $web.Lists)

       {

      

             

              # Break in Inheritance, this will allow you to add groups, otherwise it will not allow

              $spList.BreakRoleInheritance($true);

              # create Role Assignment  

              $roleAssignment = new-object Microsoft.SharePoint.SPRoleAssignment($spGroup)

              # Get the RoleDefinition for permission level

              $roleDefinition = $web.RoleDefinitions[$PermissionLevel];

              # Bind Role Definition

              $roleAssignment.RoleDefinitionBindings.Add($roleDefinition);

              # Add Role to List

              $spList.RoleAssignments.Add($roleAssignment)

              # Turn the Inheritance ON

              $spList.BreakRoleInheritance($false);

              # Update List

              $spList.Update();

             

       }

}

$spSite.Dispose()

$spWebs.Dispose()