How can the UTF-8 Byte Order Mark be enforced in the output of a Perl file?

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To enforce the UTF-8 Byte Order Mark in the output of a Perl file, you can set the utf8 flag for the standard output file handle STDOUT using the binmode function.

Here's an example:

binmode(STDOUT, ':utf8');
print "\x{FEFF}"; # Print the BOM
print "Hello, world!\n";

In this example, we first set the utf8 flag for STDOUT using the binmode function. Then, we print the UTF-8 BOM character (\x{FEFF}) using the print function. Finally, we print the rest of the output (Hello, world!) as UTF-8 encoded text.

By printing the BOM character at the beginning of the output, we ensure that applications that read the output will recognize it as UTF-8 encoded text and handle it accordingly.