How to use cron in ruby on rails (2.3.5). Please help?

Asked by suketa (2

) March 7th, 2011

Can anyone please guide through website links or books names or any other medium. I am pursuing a project on the same platform. There is one procedure in which I have to set the schedule certain data and such that it automatically send the data to third party on the respective scheduled dates. I have to do the whole scheduling part through cron so that sending data on the scheduled dates job done by it.
please help in this concern as I don’t have idea how to do these.

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1 Answer

At the UNIX prompt, type man crontab and help documentation will appear.

—

Crontab is the interface you use to schedule jobs in cron. It launches a basic text editor – usually vi but anything you want – and you enter in one line per scheduled job in the cron file. A line there might look something like:

56 4 23 1 * /path/to/shell_script_to_run_ROR.sh

Which means: at 04:56 on January 23, regardless if it’s M-F, execute the program at /path/to/shell_script_to_run_ROR.sh.

If you wanted something to run every Monday at 12 midnight:

00 00 * * 1 /path/to/run_something.sh

Where the 1=Monday. For the other days of the week 0=Sunday and 6=Saturday.

Again, see the man page for more details, options, and examples.

One more thing, a cron file cannot have any blank lines in it. Also, if anything is wrongly formatted, then none of the scheduled jobs may be able to run. You can start a line with the pound sign, #, for comments, like so:

# This is my crontab
#————————————————————-
#
# Run some maintenance every Wednesday night at 9:30pm.
30 21 * * 3 /path/to/maintenance.sh
#
#————————————————————-