Using a .txt file to populate a Powershell Script - powershell

Question

I have a Powershell script that queries Active Directory, by User ID, and outputs to a .csv file listing user attributes that I specify.
The script works flawlessly for a single user, but I would like to use a text file, with a list of users, to populate the script and create output for multiple users all at once.
Please advise.
This is my original script pulling the user list from a specific OU:
import-module ActiveDirectory
$ADGroupParams=#{
'Server' = 'corp.xxxx.com'
'Searchbase' = 'OU=Security Groups,DC=corp,DC=xxxx,DC=com'
'Searchscope'= 'Subtree'
'Filter' = '*'
'Properties' = '*'
}
$SelectParams=#{
'Property' = 'cn', 'managedBy', 'info', 'sAMAccountName', 'created'
}
get-aduser #ADGroupParams | select-object #SelectParams | export-csv "C:\Scripts\Users_By_OU.csv"

Answer 1

Assuming your text file is a txt file with one username per line:
# Put all ADUser properties you want dumped to the CSV in an array
$adUserProperties = #(
'one',
'attribute',
'per',
'index'
)
# Read the users from the file, get the ADUser object for each one,
# selecting the properties you want dumped to the CSV, and export the
# returned information to a CSV file.
Get-Content \path\to\users.txt | Foreach-Object {
Get-ADUser -Filter "SamAccountName -eq '$($_)'" -Properties $adUserProperties
} | Select-Object -Properties $adUserProperties | Export-Csv -NoTypeInformation users.csv