hmm [sh]

addbom.sh

#!/bin/sh

if [ $# -eq 0 ];
then
	echo usage $0 files ...
	exit 1
fi

for file in $*;
do
	echo "# Processing: $file" 1>&2
	if [ ! -f "$file" ];
	then
		echo Not a file: "$file" 1>&2
		exit 1
	fi
	TYPE=`file - < "$file" | cut -d: -f2`
	if echo "$TYPE" | grep -q '(with BOM)';
	then
		echo "# $file already has BOM, skipping." 1>&2
	else
		( mv ${file} ${file}~ && uconv -f utf-8 -t utf-8 --add-signature < "${file}~" > "${file}" ) || ( echo Error processing "$file" 1>&2 ; exit 1)
	fi
done