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Add Date column to an existing csv file
$today = [System.DateTime]::Today.ToString("yyyyMMdd")
Import-Csv -Header Column1,Column2 -Delim ',' 'C:\sample.csv' |
ForEach {
New-Object psobject -Property @{Date=$today;Col1=$_.Column1; Col2=$_.Column2}
} | Select-Object Date,Col1,Col2 | Export-Csv -NoTypeInformation 'C:\sample.csv'
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