Mine

    for ((i=0; i<=NUM_FILES; i++)); do         xdim=${TT_DIM[i]%%x*}         ydim=${TT_DIM[i]##*x}         X0=${SHOWCASE_TITLES_X_ARRAY[i]}         X1=$((X0 + xdim))         Y0=${SHOWCASE_TITLES_Y_ARRAY[i]}         Y1=$((Y0 + ydim))         [[ $(( (X0/2) * 2)) -ne  $X0 ]] && X0=$((X0-1))         [[ $(( (Y0/2) * 2)) -ne  $Y0 ]] && Y0=$((Y0-1))         [[ $(( (X1/2) * 2)) -ne  $X1 ]] && X1=$((X1+1))         [[ $(( (Y1/2) * 2)) -ne  $Y1 ]] && Y1=$((Y1+1))         echo -n "         <button name=\"$((i+1))\" "         echo -e "x0=\"$X0\" y0=\"$Y0\"  x1=\"$X1\" y1=\"$Y1\"/>"     done