Using Select-String -NotMatch in Powershell

Question

I'm trying to find .nfo files that aren't XML. It seems to mostly work, but some of the files are XML and are still being listed. One example has this for the first line:

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

Here is my code. I'm not sure what I am doing wrong.

Get-ChildItem "c:\*.nfo" -recurse | ForEach-Object {
    if (Get-Content -LiteralPath $_ -First 1 | Select-String -Pattern 'xml' -NotMatch) 
    {
        Write-Output $_.Fullname
    }
}

I don't care if they are properly formatted XML files so I am just using the first line to test.

A different option to Mathias' would be to pipe the FileInfo object to Get-Content, the PSPath property would be used as an alias for LiteralPath. if (-not ($_ | Get-Content -TotalCount 1).Contains('xml')). Select-String shouldn't be needed as you've already got the first line anyway, and -First is an alias so using the main parameter name -TotalCount may be better practise. — Dabombber
– Dabombber, Commented Nov 20, 2020 at 7:17
I guess some of your xml files start with an empty line. Please try to create an minimal reproducible example: remove the out loop, and show the first lines of your failing xml file in the question. — iRon
– iRon, Commented Nov 20, 2020 at 8:16
@iRon I thought that two and tried getting the first two lines but it was the same result. I also looked at one of those files in Notepad++ showing all characters and there is no extra characters like a line feed. I will change the code to output the first line and see what it shows. — user1612851
– user1612851, Commented Nov 20, 2020 at 15:12
The answer #1 below gave errors due to not using LiteralPath. When using LiteralPath it yielded the exact same results as my code. Some of the filenames have brackets. — user1612851
– user1612851, Commented Nov 20, 2020 at 15:13

Алексей Семенов · Accepted Answer · 2020-11-20 10:37:22Z

1

try this

Get-ChildItem "c:\*.nfo" -recurse | Where-Object{(Get-Content $_ -First 1) -notmatch 'xml'}

answered Nov 20, 2020 at 10:37

Алексей Семенов

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