NKF

Options

--oc=<encoding>: Specify the output encoding
--overwrite[=SUF]: Preserve timestamp of original files

Adding and Removing BOM (byte order mark)

nkf-add-bom.sh:

$ nkf --overwrite --oc=UTF-8-BOM $@

nkf-del-bom.sh:

$ nkf --overwrite --oc=UTF-8 $@