SharePoint PowerShell: Get list of all users present in a site under different SharePoint Groups

$site = Get-SPSite <Provide Site Collection URL here>

$web = $site.OpenWeb()

$groups = $web.sitegroups

 

foreach ($grp in $groups) {

    "Group: " + $grp.name;

    $groupName = $grp.name

    write-host "Group: " $groupName   -foregroundcolor green

    foreach ($user in $grp.users) {

            "User: " + $user.name

            write-host "User " $user.UserLogin   -foregroundcolor red

    }

}




source