Get-AdGroupMember for multiple groups

Question

How do I check if the mentioned security groups exists or not? I would also want the exported .csv to mention 'No members' instead of skipping it.

Also, how do I refine below script? And I would like to get member's details.

$group_list = get-content C:\temp\group_list.txt
$results = foreach($group in $group_list){
$checkgroup = get-adgroup -filter {name -eq $group} | select name
if($checkgroup -ne $null){
$members = get-adgroupmember $group | select samaccountname

if($members -ne $null){
[PSCustomObject]@{GroupName=$group;Members=($members.samaccountname | Out-String).Trim()}
}
else{
[PSCustomObject]@{GroupName=$group;Members="None"}
}    

}
else{
    [PSCustomObject]@{GroupName=$group;Members="Group not exist"}
}
}
$results | Export-csv C:\temp\Group_Members.csv -NoTypeInformation

Answer 1

# output active directory groups and members to csv (also output empty groups with 'No Members' value)
# assumes run on domain controller or import of ActiveDirectory module

$allgroups = Get-ADGroup -Filter *

$result = foreach ( $group in $allgroups ) {

    $hash = @{GroupName=$group.SamAccountName;Member=''}
    $groupid = $group.distinguishedname

    if ( $members = Get-ADGroupMember $groupid ) {

            foreach ( $member in $members ) {

                $hash.Member = $member.Name
                New-Object psObject -Property $hash
            }
    }
    else {
        $displayname = "No Members"
        $hash.Member = $displayname
        New-Object psObject -Property $hash
    }
}

$result | Export-Csv -Path C:\temp\ADGroups.csv -NoTypeInformation

# End