View Crontab Logs

Refer: https://askubuntu.com/questions/56683/where-is-the-cron-crontab-log

On a default installation the cron jobs get logged to

/var/log/syslog

You can see just cron jobs in that logfile by running

grep CRON /var/log/syslog

The above grep will return nohthing if your crontab has not been configured yet.