ps -eaf|grep cronMake sure your cron daemon is running. (I.e. ps -eaf|grep cron)
Nov 20 03:20:01 linda1 CROND[2563830]: (root) CMD (sleep 40; nice -n19 ionice -c3 /usr/local/busoft/da-migration-tool/migratiok, it is running, the next thing to do is look at your /var/log/cron file to see what it says.