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The cron service searches its spool area (usually /var/spool/cron/crontabs) for crontab files (which are named after user accounts); crontabs found are loaded into memory.

cron also reads /etc/crontab, which is in a slightly different format.

Additionally, cron reads the files in /etc/cron.d: it treats the files in /etc/cron.d as in the same way as the /etc/crontab file.

The intended purpose of /etc/cron.d/ directory feature is to allow packages that require finer control of their scheduling than the /etc/cron.{daily,weekly,monthly} directories to add a crontab file to /etc/cron.d.

View Users Cronjob

crontab -u userName -l

View Root User Cronjob

crontab -l

View /etc/crontab

A cronjob can be also run from /etc/crontab file. To view it, enter:
# less /etc/crontab

View Daily Cronjob

cd /etc/cron.daily/
ls -l
cat filename

View Hourly Cronjobs

cd /etc/cron.hourly/
ls -l
cat filename

View Weekly Cronjobs

cd /etc/cron.weekly/
ls -l
cat filename

View Monthly Cronjobs

cd /etc/cron.monthly/
ls -l
cat filename

View Software (Package) Specific Cronjobs

cd /etc/cron.d/
ls -l
cat filename