Permission audit report for site and all sub sites using PowerShell

Use below script to get Permission audit report for site and all sub sites using PowerShell,

Add-PSSnapin "Microsoft.SharePoint.PowerShell"
$URL="https://intranet.contoso.com/sales/mysite/"

     $site = Get-SPSite $URL

     #Write the Header to "Tab Separated Text File"

        "Site Name`t  URL `t Group Name `t User Account `t User Name `t E-Mail" | out-file "E:\Ulhas\UsersandGroupsRpt.txt"
   

     #Iterate through all Webs

      foreach ($web in $site.AllWebs)

      {

        #Write the Header to "Tab Separated Text File"

        "$($web.title) `t $($web.URL) `t  `t  `t `t " | out-file "E:\Ulhas\UsersandGroupsRpt.txt" -append

         #Get all Groups and Iterate through  

         foreach ($group in $Web.groups)

         {

                "`t  `t $($Group.Name) `t   `t `t " | out-file "E:\Ulhas\UsersandGroupsRpt.txt" -append

                #Iterate through Each User in the group

                       foreach ($user in $group.users)

                        {

                           #Exclude Built-in User Accounts

                    if(($User.LoginName.ToLower() -ne "nt authority\authenticated users") -and ($User.LoginName.ToLower() -ne "sharepoint\system") -and ($User.LoginName.ToLower() -ne "nt authority\local service"))

                    {

                                "`t  `t  `t  $($user.LoginName)  `t  $($user.name) `t  $($user.Email)" | out-file "E:\Ulhas\UsersandGroupsRpt.txt" -append

                             }

                        }

         }

       }
    $site.dispose();

    write-host "Report Generated at E:\Ulhas\UsersandGroupsRpt.txt"