Perl

Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

See more HTML-to-XML/Text Examples

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

my $charset = Chilkat2::Charset->new;

$charset->FromCharset('utf-8');
$charset->ToCharset('bom-utf-8');

my $success = $charset->ConvertFile('qa_data/txt/helloWorld.txt', 'qa_output/helloWorldBom.txt');
if (!$success) {
    print $charset->LastErrorText, "\n";
    exit;
}

print "Success.\n";