I have this file structure

In PowerShell my location is set to Folder. SubSubFolders has a lot of xml files, and I want to add a line there only if content of version.txt file is a and that line doesn't exist there already.

I was able to figure out how to change an xml file in particular SubSubFolder, but I can't do it when I start in Folder folder and and taking into consideration version

#here I need to add: only if version.txt content of xml file in parent folder is "a"
$files = Get-ChildItem -Filter *blah.xml -Recurse | Where{!(Select-String -SimpleMatch "AdditionalLine" -Path $_.fullname -Quiet)} | Format-Table FullName

foreach($file in $files)
{
    (Get-Content $file.FullName | Foreach-Object {  $_
                                                if ($_ -match "AdditionalLineAfterThisLine")
                                                {
                                                    "AdditionalLine"
                                                }
    }) | Set-Content $file.FullName
}

CodePudding user response：

If I understand you correctly, you're looking for the following:

$files = (
  Get-ChildItem -Filter *blah.xml -Recurse | 
    Where-Object{
      -not ($_ | Select-String -SimpleMatch "AdditionalLine" -Quiet) -and
      (Get-Content -LiteralPath "$($_.DirectoryName)/../version.txt") -eq 'a'
    }
).FullName

Note that the assumption is that the version.txt file contains just one line. If it contains multiple lines, the -eq 'a' operation would act as a filter and return all lines whose content is 'a', which in the implied Boolean context of -and would yield $true if one or more such lines, potentially among others, exist.