Unable to add an extra column to an existing CSV file

Question

I have a .csv file which contains data as below:

Name ID
ABC 1234
CDE 3456

I am trying to insert a column called \"Date\" as the first col

Answer 1

You need to add the property to the objects:

$a= import-csv -path c:\filename.csv -header Name,Id
foreach($item in $a){
    Add-Member -Input $item -MemberType NoteProperty -Name Date -Value '2018-03-28'
}
$a | Select-Object Date, Name, ID | export-csv -path c:\outfile.csv -Notypeinformation

Answer 2

You can make use of calculated properties like this -

Import-Csv -path C:\filename.csv |
Select-Object *,@{Name='Date';Expression={'2018-03-28'}} | 
Select-Object Date, Name, ID |
Export-Csv -path C:\Outfile.csv -NoTypeInformation