Remove lines which not consist / filter csv flle-CodePudding

I have csv files with wsus raport ( there are server names ) I have also txt file with server names which are in my scope.

I would like remove entry from my csv files if not match txt files.

I found solution how to to something appositive ( keep lines if match)

$SourceFile = 'C:\temp\wsus.csv'
$scope = Get-Content C:\Temp\windows_server.txt
foreach ($Pattern in $scope)
{
(Get-Content $SourceFile) | Where-Object { $_ -notmatch $Pattern } | Set-Content $SourceFile
}

I was hopping that I change -notmatch to -match and it will work but doesn't.

Best Regards, Krzysztof

CodePudding user response：

You basically need to write it exactly the other way round:

Get-Content $sourceFile | where {
    foreach($pattern in $scope) {
        if ($_ -match $pattern) {
            return $true
        }
    }
}

Another alternative would be using Select-String:

Get-Content $sourceFile | Select-String -Pattern $scope

Also, when working with CSV, you should consider using the appropriate cmdlets (like Import-Csv).

CodePudding user response：

Assuming your wsus.csv looks anything like this:

Server,Something you need to know,Something you want to forget
Srv01,Main storage,blahblah
Srv02,Mail server,more blah

and your windows_server.txt simply holds servernames, each on a separate line, then you could do this:

$SourceFile = 'C:\temp\wsus.csv'
$scope      = Get-Content C:\Temp\windows_server.txt
$csv        = Import-Csv -Path $SourceFile | Where-Object {$scope -contains $_.Server }
# now export the scoped csv (I'd suggest to a new file, but you can overwrite the $SourceFile if you must)
$csv | Export-Csv -Path 'C:\temp\ScopedWsus.csv' -NoTypeInformation