搜索字符串并删除其他所有内容并使用 Powershell 粘贴到新文件

Question

In main directory "Movies" I have multiple directories with "Movie Name" and each directory contain "movie_name.nfo" file.

Movies
  |- Avatar
       - Avatar.nfo
  |- Ad Astra
       - Ad Astra.nfo

In those "movie_name.nfo" files I have multiple links and each link is stored in separated line:

http://www.imdb.com/title/tt8134742/
https://www.themoviedb.org/movie/489064/
http://www.csfd.cz/film/603376

What I want is:

If "movie_name.nfo" file contain string "themoviedb", then everything else is deleted in that file except that line which contain searched string. Every lines which was deleted (not contain searched string) are copied to new file with name "movie.nfo" in same folder as is "movie_name.nfo" file.

I tried several options, but without success, this is what I have now,

Get-Content -Path "./*" -Filter *.nfo -Recurse | Where {$_ -notmatch "themoviedb"} | Set-Content "movie.nfo"

Thank you.

Answer 1

Assuming the movie info files always have the same basename like their folder you can use a loop to

1. "construct" the target file name with Join-Path
2. check if the file contains the pattern with Select-String
3. if there's a match remove all other lines with Select-Object
4. if not create a new file containing the pattern with Out-File

You could start with something like this:

Get-ChildItem -Path .\movies -Directory |
ForEach-Object {
    $Pattern = 'themoviedb'
    $FileName = Join-Path -Path $_.FullName -ChildPath ($_.BaseName + '.nfo')
    $tempResult = Select-String -Path $FileName -Pattern $Pattern 
    if ($tempResult) {
        $Content = Get-Content -Path $FileName
        $Content | 
            Select-Object -Skip ($tempResult.LineNumber - 1) -First 1 |
                Set-Content -Path $FileName -Force
        $nfoFileName = Join-Path -Path $_.FullName -ChildPath 'movie.nfo'
        $newContent = $Content |
            Select-Object -First ($tempResult.LineNumber - 1) |
                Out-String
        $newContent += $Content |
            Select-Object -Skip ($tempResult.LineNumber) |
                Out-String
        $newContent |
            Out-File -FilePath $nfoFileName
    }
    else {
        $nfoFileName = Join-Path -Path $_.FullName -ChildPath 'movie.nfo'
        $Pattern | 
            Out-File -FilePath $nfoFileName
    }
}

I'd recommend to read always the complete help for the cmdlets you use ... including the examples to learn how to use them.