Get list of users from file for powershell loop - powershell

Question

I'm trying to modify this PowerShell script to allow input of users from a text or CSV file. I've pulled the script directly from Tim Rhymer.
This is the original script:
Import-Module ActiveDirectory
function Get-ADUsersLastLogon() {
$dcs = Get-ADDomainController -Filter {Name -like "*"}
$users = Get-ADUser -Filter *
$time = 0
$exportFilePath = "c:lastLogon.csv"
$columns = "name,username,datetime"
Out-File -FilePath $exportFilePath -Force -InputObject $columns
foreach ($user in $users) {
foreach ($dc in $dcs) {
$hostname = $dc.HostName
$currentUser = Get-ADUser $user.SamAccountName | Get-ADObject -Server $hostname -Properties lastLogon
if ($currentUser.LastLogon -gt $time) {
$time = $currentUser.LastLogon
}
}
$dt = [DateTime]::FromFileTime($time)
$row = $user.Name + "," + $user.SamAccountName + "," + $dt
Out-File -FilePath $exportFilePath -Append -NoClobber -InputObject $row
$time = 0
}
}
Get-ADUsersLastLogon
I'm thinking I should modify the portion of the script the sets the variable of $user and how the foreach ($user in $users) loop processes each user, but can't figure it out.

Answer 1

As for this...
allow input of users from a text or CSV file.
… that is all that this is...
$users = Get-ADUser -Filter *
… You just replace that with your file
$users = Import-Csv -Path $UncToUserList.csv
Yet, by your question, since this is a really common, basic PowerShell thing, I am assuming you are very new to this and would advise really ramping up on PowerShell using all the freely available learning resources on TechNet MVA, MSChannel9 and YouTube, as well as freely available eBooks, as to avoid much confusion and frustration in your learning cycles as possible.
Also, you should never run any untrusted code, or code you do not fully understand. Use only in a test environment that you can fully recover from before ever considering production runs to avoid things that can cause you to have an RPE error --- 'Resume Producing Event'.