Get-Content .\usersToUpdate.txt |
Get-ADUser -Properties middleName |
ForEach {
# The next lines are used to the the “Display Name” seen in ADUC. Comment these out if you do not want to update the DisplayName
If ($_.middleName -eq $null) {
Set-ADUser $_ -DisplayName ($_.GivenName + ” ” + $_.Surname)
}
Else {
Set-ADUser $_ -DisplayName ($_.GivenName + ” ” + $_.middleName + ” ” + $_.Surname)
}
# These lines set the Name attribute (“Full Name” attribute in ADUC)
If ($_.middleName -eq $null) {
Rename-ADObject $_.DistinguishedName -NewName ($_.GivenName + ” ” + $_.Surname)
}
Else {
Rename-ADObject $_.DistinguishedName -NewName ($_.GivenName + ” ” + $_.middleName + ” ” + $_.Surname)
}
}

This will read in a list of sAMAccountNames (one per line) from a text file named usersToUpdate.txt and then make the changes. Comment out the displayname lines if you only need to update the Name and vice versa. It will check for the presence of a middleName to be sure that an extra space isn’t introduced.