test $filePath=\mathrm{"}path\mathrm{/}to\mathrm{/}your\mathrm{/}file\mathrm{.}txt\mathrm{"}filePath\; =\; "path/to/your/file.txt"$newLine = “This is the new first line”

$existingContent=Get-ContentexistingContent\; =\; Get-Content$filePath $newContent=newContent\; =$newLine + “n" + ($existingContent -join "n”)

Set-Content $filePathfilePath$newContent