> anyone who has a good example on how to write in the crontab if you want to schedule 
>a job to run every four week.
> Is it possible to do that in unix cron job schedule.

Yes, it is very possible.

Run 'crontab -e' as apropeate user. Your $EDITOR will open.
Write as described in crontab(5) manual ('man 5 crontab'):

0 */4 * * * your_command

This will run your_command every four hours (first field which minutes,
second field in which hours)

You can also edit the /etc/crontab-file (if avaible on your system.) This
file has a different syntax (you specify the user who is going to run the
command too.)

-- 
/Nils H�glund, Naqua KB

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