change_license.sh
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	#! /usr/bin/env bash

	SRC_DIR=$(dirname $0)

	tmp1=$(tempfile)
	tmp2=$(tempfile)

	# copy file
	cp $1 ${tmp1}
	# remove old header
	awk -f ${SRC_DIR}/remove_header.awk ${tmp1} > ${tmp2}
	# copy new header
	cat $2 ${tmp2} > ${tmp1}

	rm ${tmp2}
	# finally mv the temporary
	mv ${tmp1} $1