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Accepted
Doug Chase
Asked: 2009-08-26 06:23:19 +0800 CST

PowerShell text output vs. console output

  • 772

I'm building a script to monitor my event logs. This command gathers only "Error" and "Warning" messages and places them into the $entries array.

$entries = $log.Entries |
? {$_.TimeWritten -gt ($(Get-Date).AddDays(-2)) -and `
(($_.EntryType -like "Error") -or `
($_.EntryType -like "Warning"))} |
Format-Table -wrap

If I output $entries in the console, it displays what I want - the log entries - but if I pipe this out to a text file (Add-Content $output $entries) I get the .NET class name only (System.Diagnostics.EventLogEntry). I have also tried foreach ($entry in $entries) with similar results.

What's the basic PowerShell principle I'm missing here?

logging powershell

3 Answers

  1. Best Answer

    Basically - the add-content/set-content command just do a ToString() on whatever you pass to it. For many .NET objects, that is just the class name.

    If you do:
    out-string -inputobject $entries | add-content "yourfile.txt"

    That should properly convert to a string and output it to your text file.

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  2. Add-content will give you this behavior, if you want the fields rather than the object description then the simplest approach is to just use traditional file redirection e.g. 

    $entries > $output

    or 

    $entries >> $output

    if you want to append. This works as I would expect it to for your example code while your example of

    Add-Content $output $entries

    Only outputs the object type description (e.g. Microsoft.PowerShell.Commands.Internal.Format.FormatEntryData ) for me.

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  3. Piping via: | Add-Content $output

    does not appear to work well, when the content being piped contains numerous lines.

    For example:

    $output = "C:\temp\test.txt" 
$TimeStamp = Get-Date; "STARTED: " + $TimeStamp | Out-File $output -width 800
Get-ItemProperty -path "HKLM:\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\" | Add-Content $output

    In the above example, the test.txt file gets properly created, including the opening comment. However, the Get-ItemProperty output appears as Chinese characters.

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