Powershell to add Read permission on all files in a directory

Recently I needed to update all the files in a specific directory, adding Read permission for the "Users" NTFS group.  Here is a Powershell script to do that.  It can be easily modified to update other users/groups or different permission sets.

$base = "C:\somefolder"

$files = get-childitem $base

foreach ($file in $files) {

    $Acl = Get-Acl $file.FullName

    $Ar = New-Object  system.security.accesscontrol.filesystemaccessrule("Users","Read","Allow")

    $Acl.SetAccessRule($Ar)

    Set-Acl $file.FullName $Acl

}