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This is a single line PowerShell expression, although you could easily insert it into a script file to save some typing. I’ve inserted line breaks using the escape character (`) to make this easier to read.
This expression will go through all the computer names in C:\computers.txt. Each string is validated by Where-Object which strips out any surrounding spaces and only sends on strings with a length greater than 0. This weeds out blank lines. Each computer name is then passed to ForEach-Object which uses Get-WmiObject to query the Win32_NTEventLogFile, looking for event logs with more than 0 entries.
Each event log is then passed to Select-Object which creates a custom object for the computer, defining properties for name, size and maximum size in KB and a percentage used. These results are piped to Sort-object which sorts on the computername property. Finally output is piped to Format-Table which groups the output by computername and prepares a formatted report.
I ended the expression by creating a report, which you could have further sent to a file using Out-File or directly to a printer using Out-Printer. Or perhaps instead of a formatted report, you could have created an HTML report using ConvertTo-HTML. The point is that PowerShell’s pipeline is flexible and versatile.
If you are new to PowerShell looking for a resource, take a look at Windows PowerShell v1.0: TFM 2nd Edition. Also keep an eye on the blog for announcements regarding PowerShell training this year. Finally, if you need help with this one-liner or any PowerShell question, please join the discussion at ScriptingAnswers.com.
If you want to try this one-liner out, download it here.