See what files are listed in /var/spool/cron/crontabs. Below is an example.
root@esso0es0070:/var/spool/cron/crontabs # ls -l
total 15
-rw-r--r-- 1 adm cron 2031 Sep 18 1997 adm
-rw------- 1 informix cron 639 Apr 02 2002 informix
-rw------- 1 root cron 1801 May 31 2002 root
-rw-r--r-- 1 sys cron 864 Sep 18 1997 sys
-rw-r--r-- 1 root cron 1133 Apr 06 2000 uucp
Below is a partial listing of our root cron jobs which can be viewed with crontab -l or by viewing the "root" file.:
#0 3 * * * /usr/sbin/skulker
#45 2 * * 0 /usr/lib/spell/compress
#45 23 * * * ulimit 5000; /usr/lib/smdemon.cleanu > /dev/null
0 11 * * * /usr/bin/errclear -d S,O 30
0 12 * * * /usr/bin/errclear -d H 90
0 3 * * * /usr/remote/bin/skulker 1> /tmp/skulker.log 2>&1
30 0 * * 0 shutdown -Fr
0,30 * * * * /usr/local/bin/up
If you as a user run crontab -l and get a message like the following, that is because you don't have any crontab jobs (or file) in the aforementioned path. This is to be expected for the vast majority of user accounts.
user@esso0es0070:/ $ crontab -l
0481-103 Cannot open a file in the /var/spool/cron/crontabs directory.
A file or directory in the path name does not exist.