如何使用 PowerShell 中的选择字符串查找字符串不匹配的文件？

Question

I have a lot of file. I want to find the file which is not contain of a string. I try this, but it return duplicate file name.

$File = Get-ChildItem -Path "D:\*.txt"
$Result = Select-String -Pattern "Identifier -NotMatch $File | Select-Object -ExpandProperty FileName
Write-Host "Result: $Result"

It return like this

1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 1589.txt 158A.txt 158A.txt 158A.txt 158A.txt 158A.txt 158A.txt AB8A.txt AB8A.txt AB8A.txt AB8A.txt AB8A.txt

Anyone can help please. Thank you

Answer 1

-NotMatch will make Select-String return the lines that don't match, it doesn't work at the file level.

To do what you want, run ALL the files through Select-String and then filter out those that have any matches:

$result = Get-ChildItem -Path D:\ -Filter *.txt |Where-Object {
  @($_ |Select-String -Pattern "Identifier" |Select-Object -First 1).Count -eq 0
} |Select-Object -ExpandProperty FileName

We grab the first possible match from the file in question - if none is found, the array expression will be empty and Count -eq 0