-} else {
- delta=`{awk 'END{print '^`{date +%s}^-^`{stat -c '%Y' /var/cache/cran2deb/cache.rda}^'}' </dev/null}
- echo Cache is $delta seconds out of date.
-}
-if (![ -e /var/cache/cran2deb/cache.rda ] || [ $delta -gt $update_period ]) {
+else
+ seconds_time=$(date +%s)
+ seconds_file=$(stat -c '%Y' "${cache_rda}")
+ delta=$(($seconds_time-$seconds_file))
+ echo Cache is $delta seconds out of date, auto-update after $update_period seconds.
+fi
+
+if [ ! -e "${cache_rda}" ] || [ $delta -gt $update_period ]; then