Cron is special utility that process command in periodic time such ;

• doing regular backup every night
• email special report every week
• etc

cron access can be usefull but sometime not, depend on the command issued.

As super user we can list all of entire user crontab entries using log locate in /var/log

su-2.05b# tail -f /var/log/cron
Apr 30 20:30:00 erau /usr/sbin/cron[81893]: (root) CMD (/usr/libexec/atrun)
Apr 30 20:30:00 erau /usr/sbin/cron[81894]: (root) CMD (/usr/local/bin/php /usr/local/share/cacti/poller.php > /dev/null)
Apr 30 20:35:00 erau /usr/sbin/cron[84459]: (root) CMD (/usr/local/bin/php /usr/local/share/cacti/poller.php > /dev/null)
Apr 30 20:35:00 erau /usr/sbin/cron[84462]: (root) CMD (/usr/libexec/atrun)
Apr 30 20:40:00 erau /usr/sbin/cron[87061]: (root) CMD (/usr/libexec/atrun)
Apr 30 20:40:00 erau /usr/sbin/cron[87062]: (root) CMD (/usr/local/bin/php /usr/local/share/cacti/poller.php > /dev/null)
Apr 30 20:45:00 erau /usr/sbin/cron[90181]: (root) CMD (/usr/local/bin/php /usr/local/share/cacti/poller.php > /dev/null)
Apr 30 20:45:00 erau /usr/sbin/cron[90180]: (root) CMD (/usr/libexec/atrun)
Apr 30 20:50:00 erau /usr/sbin/cron[93304]: (root) CMD (/usr/libexec/atrun)
Apr 30 20:50:00 erau /usr/sbin/cron[93305]: (root) CMD (/usr/local/bin/php /usr/local/share/cacti/poller.php > /dev/null)

pay attention on (root) entries, that mean user who run that command in this case generate data for cacti.

You can run the command as root or sudo, otherwise you’ll get “permission denied” message

-bash-2.05b$ tail -f /var/log/cron
tail: /var/log/cron: Permission denied
-bash-2.05b$ su
Password:
kongja# tail -f /var/log/cron
Apr 30 20:36:00 kongja /usr/sbin/cron[81442]: (root) CMD (/usr/local/bin/pfstat -q >>/var/log/pfstat)
Apr 30 20:37:00 kongja /usr/sbin/cron[81504]: (root) CMD (/usr/local/bin/pfstat -q >>/var/log/pfstat)
Apr 30 20:38:00 kongja /usr/sbin/cron[81567]: (root) CMD (/usr/local/bin/pfstat -q >>/var/log/pfstat)
Apr 30 20:39:00 kongja /usr/sbin/cron[81631]: (root) CMD (/usr/local/bin/pfstat -q >>/var/log/pfstat)

happy viewing

P.S :

other usefull place to check for cron entries

/var/cron/tabs
/var/cron/atjobs
/etc/crontab

• freebsd user crontab
• /usr/libexec/atrun
• freebsd view crontab
• view cron freebsd
• freebsd crontab user
• freebsd user cron
• freebsd cron user
• crontab freebsd
• freebsd view cron jobs
• user crontab freebsd
• freebsd user crontabs
• view cron jobs freebsd
• freebsd crontab
• root cmd
• view cron
• cron freebsd
• user cron freebsd
• cron log freebsd
• freebsd configure user crontabs
• how to view crontab
• freebsd atrun
• freebsd users crontab
• freebsd see all cron jobs
• view crontab freebsd
• freebsd list all crontabs
• viewing crontab in FREEBSD
• bsd and check crontab
• bsd cron log examples
• view cron schedule
• view crontab
• (root) cmd (/usr/libexec/atrun)
• how to view cron
• local
• freebsd view crontab users
• freebsd view running crons
• freebsd where are the crontab users
• freebsd where is user crontab
• how to check crontab working freebsd
• freebsd user crontab examples
• freebsd poller php manually run
• freebsd see other user crontab
• freebsd view all crontabs
• freebsd user crontab location
• freebsd user crontabs location
• freebsd user view
• freebsd users cron
• freebsd user crontab -e
• freebsd user cron scripts
• freebsd view all cron job
• freebsd php cron