BOM is actually a “zero-width non-breaking space” (practically a NULL character) and it is represented as U+FEFF
| Unicode Encoding | In ISO-8859-1 BOM appears as |
| UTF-8 |  |
| UTF-16 (big endian) | þÿ |
| UTF-16 (little endian) | ÿþ |
| UTF-32 (big endian) | □□þÿ (□ is the ASCII null character) |
| UTF-32 (little endian) | ÿþ□□ (□ is the ASCII null character) |
Remove BOM from an XML file
Just open the file in vim text editor use the “nobomb” command# vim file.xml :set nobomb :wq
Removal from HTML Files
Even if you have set the “charset=utf-8″ meta property right -it does not mean that you will not face the BOM problem. If a BOM character is causing problems in your HTML display -the problem actually lies in the text editor and not in your HTML/CSS code.Most HTML editors, like Dreamweaver, Programmer’s Notepad, TextPad etc., do provide a way to disable BOM. The option usually comes in the place where you set the encoding of your text editor. It may appear in the form of “UTF-8 without BOM” or “UTF-8 No BOM”
Appearance of  character in your HTML code can also be solved using the above encoding change in HTML editor.
Setting UTF without BOM in Macromedia Dreamweaver
Setting UTF without BOM in Programmer's Notepad
Detection and Removal of BOM in UNIX/Linux
Find the list of files containing BOM characters1 | find /var/www/website/ -type f -print -exec hd -n 3 {} \; | grep -1 "ef bb bf" | grep "some_part_of_the_path" > bom_lines.txt |
1 | while read l; do sed -i '1 s/^\xef\xbb\xbf//' $l ; done < bom_lines.txt |
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