如何通过 powershell 脚本编辑文本文件中的行

Question

I'm new in powershell world and of courser I'm stuck. I'm trying to iterate through text file and to find some lines and to edit it. Cannot use simple replace flag because I have some other logic involved.

So my approach is like this:

Get-ChildItem -Path $JsonsFolderPath  -File -Recurse -Filter *.json | ForEach-Object {}

With this line I iterate through all json's in $JsonsFolderPath folder.

Now, hot to iterate thorugh all line of a file and do some custom logic?

I've tried something like this: (this goes inside upper foreach)

$content = Get-Content -Path $_.FullName |
    ForEach-Object {
        if(//something)
        {
            return ModifyFunction($_)
        }
        else
        {
            return $_ // do not modify
        }
    } | Set-Content -Path $_.FullName

How to approach this?

Answer 1

you can loop over the lines in powershell

foreach($line in [System.IO.File]::ReadLines(<file_path>)) {
    $line.Replace('<original_string>', '<new_string>')
}

you can also add conditions or a counter to only edit specific line or at a specific line number. For the specific line number, just declare a counter variable before the for-loop and a target line number. Increment the counter by 1 in the for loop and check, whether $counter -eq $targetLineNumber before you replace the contents in that line.

If you know the exact string, you want to replace, then i refer you to this link:

https://shellgeek.com/powershell-replace-line-in-file/

Cheers.