Get all Groups and Users in a Site Collection or Web

Recently a user contacted me asking how to get all the groups and users in a site and subsites.

Both example will output to the C:\ drive of the server.

This script will output all the groups and user from the root of a site collection and all the subsites.
$site = Get-SPSite "http://sharepointed.com"

$userOutput = @()

foreach($subWebs in $site.AllWebs)
{
Write-Host $subWebs.Title

$groups = $subWebs.sitegroups

foreach($group in $groups)
{
foreach($user in $group.users)
{
$object = New-Object PSobject
$object | Add-Member -Name 'Web URL' -MemberType Noteproperty -Value $subWebs.URL
$object | Add-Member -Name 'Web Title' -MemberType Noteproperty -Value $subWebs.Title
$object | Add-Member -Name 'Group' -MemberType Noteproperty -Value $group.Name
$object | Add-Member -Name 'Account' -MemberType Noteproperty -Value $user.Name

$userOutput += $object
}
}
}

$userOutput | export-csv c:\site_collection_$(get-date -f yyyy-MM-dd-hhmmss).csv -notypeinformation

This script will output all the groups and users from a single web.
$web = Get-SPWeb "http://sharepoint.com/sites/hr/training"

$userOutput = @()

$groups = $web.sitegroups

foreach($group in $groups)
{
foreach($user in $group.users)
{
$object = New-Object PSobject
$object | Add-Member -Name 'Web URL' -MemberType Noteproperty -Value $web.URL
$object | Add-Member -Name 'Web Title' -MemberType Noteproperty -Value $web.Title
$object | Add-Member -Name 'Group' -MemberType Noteproperty -Value $group.Name
$object | Add-Member -Name 'Account' -MemberType Noteproperty -Value $user.Name

$userOutput += $object
}
}

$userOutput | export-csv c:\web_$(get-date -f yyyy-MM-dd-hhmmss).csv -notypeinformation