File path script sharing in shell replacement file

function _replace(){
basepath=$0
> $
i=1
while read line
do
        echo "start===================================================================================" >> $
        oldpath=`echo $line|awk '{print $1$2}'|sed 's/^\///g'`
        newpath=`echo $line|awk '{print $3$4}'|sed 's/^\///g'`
        echo $oldpath >> $
        echo $newpath >> $
        if [ "$oldpath" != "" ] && [ "$newpath" != "" ];then
                refiles=`grep $oldpath -irl --include="*.$3" $2`
                for refile in $refiles
                do
                        sed -i 's#'$oldpath'#'$newpath'#ig' $refile
                        echo $refile >> $
                done
     fi
        echo "end=====================================================================================" >> $
        echo "=">> $
        echo $i >> $
        echo "=">> $
i=$(($i+1))
done < $1
}