Replace-LineInText PowerShell function to replace a specific line in a file

Replace-LineInText.ps1

function Replace-LineInText {
    [CmdletBinding()]
    param (
        [Parameter(Position=0)]
        [string]$fileDirectory,
        [Parameter(Position=1)]
        [string]$fileExtension,
        [Parameter(Position=2)]
        [int]$lineNumber,
        [Parameter(Position=3)]
        [string]$replacementText
    )
    Write-Output "fileDirectory set to [$fileDirectory]"
    Write-Output "fileExtension set to [$fileExtension]"
    Write-Output "lineNumber set to [$lineNumber]"
    Write-Output "replacementText set to [$replacementText]"
    $files = Get-ChildItem -Path $fileDirectory -Filter "*$fileExtension"
    [int]$pLineNumber = $lineNumber-1
    foreach ($file in $files) {
        Write-Output "Processing [$($file.FullName)]..."
        $fileContentFirstHalf = Get-Content $file.FullName | Select-Object -First $pLineNumber
        $fileContentSecondHalf = Get-Content $file.FullName | Select-Object -Skip $lineNumber
        $newContent = $fileContentFirstHalf+$replacementText+$fileContentSecondHalf
        Set-Content -Path $file.FullName -Value $newContent -Force
        Write-Output "`tLine [$lineNumber] has been set to [$(Get-Content $file.FullName | Select-Object -Skip $pLineNumber -First 1)]"
    }
}

# Run the function
Replace-LineInText `
    -fileDirectory "C:\files\directory" `
    -fileExtension ".txt" `
    -lineNumber 23 `
    -replacementText "This is the replacement text"