You can execute crontab if your name appears in the file /usr/lib/cron/cron.allow. If that file does not exist, you can use crontab if your name does not appear in the file /usr/lib/cron/cron.deny.
If only cron.deny exists and is empty, all users can use crontab. If neither file exists, only the root user can use crontab.
you can use crontab file,it contains the schedule of cron entries to be run and at specified times
Yes you will need root to view other users cron jobs. Generally they are stored in /var/spool/cron/tabs(depending on your OS) which only root has access too, however, you should NEVER edit these files directly anyway. As root(or the owner of the cron job) you can view/edit these jobs using crontab -u <username> -l ..to list or -e to edit.
I have cron jobs defined in my SAP systems under user <SID>adm but they are not standard SAP cron jobs(I don't think there is such a thing as a SAP standard cron job). You would need to speak to your System Administrator to check or login as the <SID>adm user and use crontab -l. The "startsap" and "stopsap" scripts you will find in your kernel directory.
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