powershell - Add header to multiple CSV files -

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i'm looking way add header line multiple csv files. problem code below add empty row @ end of each file. don't understand why there empty line need delete lines.

$header="column1,column2,column3,column4,column5,column6" get-childitem .\ -recurse -filter *.csv| foreach-object {   $header+"`r`n"+ (get-content $_.fullname | out-string) |     set-content -path $_.fullname }

the canonical way import files specifying headers , re-export them:

$header = 'column1', 'column2', 'column3', 'column4', 'column5', 'column6'  get-childitem .\ -recurse -filter '*.csv' | foreach-object {   $file = $_.fullname   (import-csv -path $file -header $header) | export-csv -path $file -notype }

export-csv add double quotes around fields of csv, though. also, parsing data objects have performance impact. if don't want double quotes added or pressed performance solution suggested @petseral in comments question might better approach you:

$header = 'column1,column2,column3,column4,column5,column6'  get-childitem .\ -recurse -filter '*.csv' | foreach-object {   $file = $_.fullname   @($header; get-content -path $file) | set-content -path $file }

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