powershell script to get all AD user without displayname

This should do it.

Get-ADUser -Filter { displayName -notlike '*' } -SearchBase "OU=somewhere,DC=domain,DC=local" |
    Select-Object Name, FirstName, LastName, DisplayName, DistinguishedName | 
    Export-Csv file.csv

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I think all of the properties I've asked for are returned by default. If any are inexplicably blank the property will need requested. For example:

Get-ADUser -Filter { displayName -notlike '*' } -SearchBase "OU=somewhere,DC=domain,DC=local" -Properties canonicalName |
    Select-Object Name, FirstName, LastName, DisplayName, DistinguishedName | 
    Export-Csv file.csv

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DistinguishedName is included because it makes pushing changes back in again afterwards a very definite process.

hello,

the script get the account, but
for lastname and firstname i have :

Microsoft.ActiveDirectory.Management.ADPropertyValueCollection

and i need the script to:

after that, i need to use the csv file with user to set a displayname like that:
displayname =  SN + Givenname

thank you Chris :)