如何在配置文件中最后一个变量数据集之后添加新行

Question

我想在变量行之后的子文件夹中添加一行到一系列cfg文件中。

some text…光。0 =一些文本光。1 =一些文本…光。N =一些文本．.. 一些文本之前
每个文本文件都有不同的n数据线。
所有我想添加的是(n+1)数据行之后的n行在每个子文件夹的cfg文件。
light.(n+1) = some text
我想在PowerShell中执行这个任务。

Answer 1

# Get all the config files, and loop over them
Get-ChildItem "d:test" -Recurse -Include *.cfg | ForEach-Object {
    # Output a progress message
    Write-Host "Processing file: $_"
    # Make a backup copy of the file, forcibly overwriting one if it's there
    Copy-Item -LiteralPath $_ -Destination "$_+.bak" -Force
    # Read the lines in the file
    $Content = Get-Content -LiteralPath $_ -Raw
    # A regex which matches the last "light..." line
    #  - line beginning with light.
    #  - with a number next (capture the number)
    #  - then equals, text up to the end of the line
    #  - newline characters
    #  - not followed by another line beginning with light
    $Regex = '^light.(?<num>d+) =.*?$(?![rn]+^light)'
    # A scriptblock to calculate the regex replacement
    # needs to output the line which was captured
    # and calculat the increased number
    # and output the new line as well
    $ReplacementCalculator = {
        param($RegexMatches)
        $LastLine = $RegexMatches[0].Value
        $Number = [int]$RegexMatches.groups['num'].value
        $NewNumber = $Number + 1
        "$LastLine`nlight.$NewNumber = some new text"
    }
    # Do the replacement and insert the new line
    $Content = [regex]::Replace($Content, $Regex, $ReplacementCalculator, 'Multiline')
    # Update the file with the new content
    $Content | Set-Content -Path $_
}

_{(*我肯定我在什么地方读到过)}

假设"轻"行是连续的，中间没有其他文本块，并且它们是有序的，最大的数字在最后。您可能必须使用正则表达式中的行结尾rn和替换文本中的' n，以使它们匹配。