I have .cfg files each named the same, in many sub-folders, having the following structures :
--some text light.0 = some text light.1 = some text light.2 = some text ... light.n = some text ...some text
I want to add a (n+1)th data line following the last (n)th line of each .cfg file :
light.(n+1) = sonme text
Each .cfg may have varied last (n)th lines.
I tried the following code, yet it seems like it is of no avail so far :
# 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
$Regex = '^light.(?\d+) =.*?$(?![\r\n]+^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 $_
}
