Reply To: Replacing csv header row

Sure. There are a couple of ways to go about that; I prefer to import the old CSV file, then use Select-Object to change the property names of objects in memory, and export back to CSV with the new property names (which become the header row). Something like this:

$propertyTranslation = @(
    @{ Name = 'givenName'; Expression = { $_.'First Name' } }
    @{ Name = 'surName';   Expression = { $_.'Last Name'  } }
    # And so on
)
 
(Import-Csv -Path 'yourCsvFile.csv') |
Select-Object -Property $propertyTranslation |
Export-Csv -Path 'yourCsvFile.csv' -NoTypeInformation

Note: The parentheses around the Import-Csv command are important, if you want to write back to the same file in a single pipeline. However, this holds the entire file in memory, which may be a problem if your CSV is very large. If you want to stream one line at a time instead, you need to read and write from different files, then move the new file back over top of the original afterward.