# StaggerNTNames.ps1
# PowerShell script to export the sAMAccountNames of all enabled users
# in the domain with passwords that expire into a series of CSV files.
#
# Copyright (c) 2018 Richard L. Mueller
# Version 1.0 - November 23, 2018
#
# ----------------------------------------------------------------------
# You have a royalty-free right to use, modify, reproduce, and
# distribute this script file in any way you find useful, provided that
# you agree that the copyright owner above has no warranty, obligations,
# or liability for such use.

# Specify the base CSV file name.
# Files will be created in the current directory with names like
# <base file name>n.csv, where n is an integer incrementing from 1.
$FileName = "Users"

# Specify the number of CSV files to be created.
$NumFiles = 5

# Retrieve the sAMAccountName of all enabled users with passwords that expire.
$Users = Get-ADUser -Filter {(Enabled -eq $True) -And (PasswordNotRequired -eq $False) -And (PasswordNeverExpires -eq $False)} | Select sAMAccountName
# If your users do not yet have passwords that expire, use the following for all enabled users.
# $Users = Get-ADUser -Filter {Enabled -eq $True} | Select sAMAccountName
# And, if you want to include disabled users, use the following.
# $Users = Get-ADUser -Filter * | Select sAMAccountName

# Determine the number of users retrieved.
$NumUsers = $Users.Count
"Total number of users: $NumUsers"

# Calculate the maximum number of users per CSV file.
$UsersPerCSV = [Math]::Ceiling($NumUsers / $NumFiles)

# $i is the CSV file number, incrementing from 1.
$i = 1

# $j is the number of users in the CSV file.
$j = 0

# $m is the total number of users processed.
$m = 0

ForEach ($User In $Users)
{
    $j = $j + 1
    $m = $m + 1
    # Add the header line, defining the field "ID".
    If ($j -eq 1) {"ID" >> .\$FileName$i.csv}
    "$User" >> .\$FileName$i.csv
    If ($j -eq $UsersPerCSV)
    {
        "$FileName$i.csv has $j users"
        $i = $i + 1
        $j = 0
    }
}

# Process the last CSV file, if there are more users.
If ($j -gt 0)
{
    "$FileName$i.csv has $j users"
}
"Total number of users in the all $NumFiles CSV files: $m"