$ sed -i '1s/^/\xef\xbb\xbf/' file-encoded-with-utf8.txt
$ sed -i '1s/^/\xef\xbb\xbf/' file-encoded-with-utf8.txt
~
✉
torstein.k.johansen @ gmail
~
🐘
@skybert@hachyderm.io
~
🎥
youtube.com/@skybert