What is method to use foreach on a txt file? - powershell

Question

Below embedded foreach commands needs $user to come from list.txt, dump groups from AD into $user.txt file and remove.
How do I specify $user as each line in the list.txt whild also verifying the formatting of the list inside the list.txt is just one name per line, no comma?
foreach ($user in .\list.txt) {
$groups = (Get-ADUser $user -Properties MemberOf).MemberOf
Add-Content -Path C:\TEMP\RemoveGroups\$user.txt -Value $groups
foreach ($group in $groups) {
Remove-ADGroupMember $group -Member $user
}

Answer 1

$List = Get-Content .\List.txt
Foreach ($User in $List){
$Groups = (Get-ADUser $user -Properties MemberOf).MemberOf
Foreach ($GroupDN in $Groups){
Try {
$Group = Get-ADGroup $GroupDN
Remove-ADGroupMember $Group -member $user -ErrorAction Stop
$Succeed = $Succeed,$Group.Name -join ";"
}
Catch {
$Failed = $Failed,$Group.Name -Join ";"
}
}
$temp = New-Object psobject -ArgumentList #{
User = $User
Succeed = $Succeed
Failed = $Failed
}
Export-Csv -InputObject $temp -Path C:\TEMP\RemoveGroups\Result.csv -Encoding UTF8 -NoTypeInformation -Append
}
You will get the CSV file like this:
User,Succeed,Failed
user1,Group1;Group2,Group3;Group4
user2,Group2;Group3,Group1;Group4

Answer 2

You can use the following code.
# Read the list of users to an array of strings.
$users = Get-Content .\list.txt
foreach ($user in $users) {
# Validate that the username only contains a-z and 0-9.
if ($user -match "^[a-zA-Z0-9]+$") {
$groups = (Get-ADUser $user -Properties MemberOf).MemberOf
Add-Content -Path C:\TEMP\RemoveGroups\$user.txt -Value $groups
foreach ($group in $groups) {
Remove-ADGroupMember $group -member $user
}
}
}