safe

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