Out-File
seems to force the BOM when using UTF-8:
$MyFile = Get-Content $MyPath
$MyFile | Out-File -Encoding "UTF8" $MyPath
How can I write a file in UTF-8 with no BOM using PowerShell?
PowerShell has changed a bit since I wrote this question 10 years ago. Check multiple answers below, they have a lot of good information!
Using .NET's UTF8Encoding
class and passing $False
to the constructor seems to work:
$MyRawString = Get-Content -Raw $MyPath
$Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding $False
[System.IO.File]::WriteAllLines($MyPath, $MyRawString, $Utf8NoBomEncoding)