Hi,

You can issue crontab -l , it will list out the all crontjob which is in you terminal (server). Sometime you will not get anything if issue the crontab -e command in you server because i think your user doesn't have the previlleges for edit the crontab;

crontab -l --> List out the all cronjobs in your server but you can't edit the cronjobs.
crontab -e --> List out the all cronjobs and you can edit the cronjobs

Regards,
Siva.P
Bangalore