My sysadmin has set up a bunch of cron jobs on my machine. I'd like to know exactly what is scheduled for what time. How can I get that list?
With most Crons (e.g. Vixie-Cron - Debian/Ubuntu default, Cronie - Fedora default, Solaris Cron ...) you get the list of scheduled cron jobs for the current user via:
$ crontab -l
or for another user via
# crontab -l -u juser
To get the crontabs for all users you can loop over all users and call this command.
Alternatively, you can look up the spool files. Usually, they are are saved under
/var/spool/cron, e.g. for vcron following directory
contains all the configured crontabs of all users - except the root user who is also able to configure jobs via the system-wide crontab, which is located at
With cronie (default on Fedora/CentOS), there is a
.d style config directory for system cron jobs, as well:
(As always, the
.d directory simplifies maintaining configuration entries that are part of different packages.)
For convenience, most distributions also provide a directories where linked/stored scripts are periodically executed, e.g.:
/etc/cron.daily /etc/cron.hourly /etc/cron.monthly /etc/cron.weekly
The timely execution of those scripts is usually managed via
run-parts entries in the system crontab or via anacron.
$ systemctl list-timers
Note that users beside root may have user systemd instances running where timers are configured, as well. For example, on Fedora, by default, a user systemd instance is started for each user that is currently logged in. They can be recognized via:
$ ps aux | grep 'systemd[ ]--user'
Those user timers can be listed via:
$ systemctl --user list-timers
An alternative to issuing the
list-timers command is to search for timer unit files (pattern:
*.timer) and symbolic links to them in the usual system and user systemd config directories:
$ find /usr/lib/systemd/ /etc/systemd -name '*.timer' $ find /home '(' -path '/home/*/.local/share/systemd/user/*' \ -o -path '/home/*/.config/systemd/*' ')' \ -name '*.timer' 2> /dev/null
(As with normal service units, a timer unit is enabled via creating a symbolic link in the right systemd config directory.)
Depending on how your linux system is set up, you can look in:
also, many distros have:
/etc/cron.d/*These configurations have the same syntax as
These are simply directories that contain executables that are executed hourly, daily, weekly or monthly, per their directory name.
On top of that, you can have at jobs (check
/var/spool/at/*), anacron (
/var/spool/anacron/*) and probably others I'm forgetting.
You can list all cron jobs with (I'm using more to list the location in the output):
sudo sh -c 'more /etc/crontab /etc/cron.d/* /var/spool/cron/crontabs/* 2>/dev/null' | less
Or without comments:
sudo sh -c 'more /etc/crontab /etc/cron.d/* /var/spool/cron/crontabs/* 2>/dev/null' \ | grep "^\s*[^#]"
crontab has entries to run the scripts in cron.hourly, daily, weekly and monthly - you can list those with:
ls /etc/cron.hourly /etc/cron.daily /etc/cron.weekly /etc/cron.monthly