cd /var/spool/cron/
There will be a file with username which has all the crons for that user.
tail -f /var/log/cron
crontab -u Un -l —> List cron jobs of user UN. Should be logged in as root to view this.
crontab -l –> List cron jobs of the user logged in
crontab -e –> Edit cron jobs of the user logged in.