-iuser,user,user,...
Consider only the crontabs of the specified users. Use *system* for the system crontab.
-euser,user,user,...
Do not consider the crontabs of the specified users.
-s Do not consider the system crontab, usually the /etc/crontab file. The system crontab usually
contains the hourly, daily, weekly and monthly crontabs, which might be better dealt with
anacron(8).
-a Use the crontabs installed in the system in addition to the ones passed as file arguments. This is
implicit if no file is passed.
-ttime
Determine the next job from this time, instead of now. The time is expressed in number of seconds
since the Epoch, as obtained for example by date+%s--date"now+2hours", and is internally
rounded to the minute.
-qtime
Do not check jobs over this time, expressed in the same way as in option -t.
-jcommand
Only look for jobs that contain command as a substring.
-l Print the whole entries of the jobs that are the next to be executed by cron. The default is to
only print their next time of execution.
-c Print every entry in every crontab with the next time it is executed.
-f Print all jobs that are executed in the given interval. Requires option -q.
-h Print usage output and exit.
-V Print version and exit.