-sys=`{cran2deb which_system}
-mkdir -p /var/cache/cran2deb/results/$sys || exit 1
-update_period=10800
-if (~ $1 full || ![ -e /var/cache/cran2deb/cache.rda ] ) {
- delta=`{awk 'END{print '^$update_period^'+1}' </dev/null}
+sys=$(cran2deb which_system)
+mkdir -p /var/cache/cran2deb/results/$sys
+#update_period=10800
+update_period=108
+
+if [ ! $1 = full -o !-e /var/cache/cran2deb/cache.rda ]; then
+ delta=$(($update_period+1))