pipe foreach loop CSV PowerShell

问题

I've written a script but cannot get it to export to CSV or output in any way.

PowerShell does not like foreach loops and exporting.

For each "folderpath/filename" in the .txt file it checks to see if the file is still there and outputs true or false + folderpath/file name.

Script works fine, just cannot get the thing to export to CSV.

Any ideas what I'm doing wrong?

foreach ($WantFile in Get-Content "C:\scripts\folderpaths.txt") {
    $FileExists = Test-Path $WantFile

    if ($FileExists -eq $True) {
        Write-Output $wantfile "True"
    } else {
        Write-Output $wantfile "False"
    }
} | Export-Csv C:\scripts\output.csv -noType

回答1:

Change your code to this:

Get-Content 'C:\scripts\folderpaths.txt' | % {
  if (Test-Path -LiteralPath $_) {
    Write-Output $_ "True"
  } else {
    Write-Output $_ "False"
  }
} | Export-Csv 'C:\scripts\output.csv' -NoType

I doubt that the resulting file will contain what you expect, though. Export-Csv exports the properties of objects. The output you generate are string objects (2 with each Write-Output statement, actually), and their only property is Length, so your result will be one column with the lengths of the strings you echo.

To create a CSV with 2 columns, one for path and the other for existence of the path you need to create objects with the desired properties, e.g. like this:

Get-Content 'C:\scripts\folderpaths.txt' `
  | select @{n='Path';e={$_}}, @{n='Exists';e={Test-Path -LiteralPath $_}} `
  | Export-Csv 'C:\scripts\output.csv' -NoType

回答2:

With regard to the original question (exporting the output of a foreach loop to CSV), you can make that output to the pipeline by wrapping it in a subexpression, but that's not going to solve the other problems in your script with regard to what it is you're trying to export:

$(ForEach ($WantFile in Get-Content "C:\scripts\folderpaths.txt"){

  $FileExists = Test-Path $WantFile 

  If ($FileExists -eq $True) {Write-Output $wantfile "True"}

  Else {Write-Output $wantfile "False"}

})| export-csv C:\scripts\output.csv -noType

回答3:

I got the same problem and i got it worked by doing as follow.

$forloop = foreach ( $i in $computers)
    {
      $i
      $out = .\psexec.exe \\$i C:\hp\hpsmh\bin\smhlogreader.exe --version 
      $out


     } 

$forloop | Out-file C:\scripts\output.txt -Append

来源：https://stackoverflow.com/questions/20275871/pipe-foreach-loop-csv-powershell

标签

powershell

csv

pipe