The
crontab(5) man page tells you how to define an activity once a month. I don't know if it's possible to do something every 30 days; you may be more successful with the
at command.
To do something at midnight on the first day of the month:
Code:
$ crontab
1 0 1 * * something
The first number is the minute, then the hour, day of month, month and day of week. Asterisks mean "any".
Alternatively:
Code:
$ crontab
@monthly something
Now, I can't tell you how to send an email reminder via ftp. Perhaps you can elaborate what you mean by that. But I can tell you how to send an email reminder:
Code:
$ crontab
@monthly echo "don't forget to tie your shoelaces" | mailx -s Reminder you@yourdomain.org
You could also do it this way:
Code:
$ crontab
@monthly echo "don't forget to tie your shoelaces"
since cron sends you command output in an email, but in this case you have no control over the recipient nor the subject.
