Question on CRON

Dear All,
i m running cron task in my application using whenever gem.
the below code runs the rake every month.
every 1.month, :at => ‘11:55pm’ do
but i want to run this rake on 1st date of every month.
how can i do it.
pls guide me on this.

Newb N. wrote:

Dear All,
i m running cron task in my application using whenever gem.
the below code runs the rake every month.
every 1.month, :at => ‘11:55pm’ do
but i want to run this rake on 1st date of every month.
how can i do it.
pls guide me on this.

Some one pls help me

try : 55 11 01 * *

regards

On Wed, Dec 30, 2009 at 12:55 PM, Newb N. [email protected]
wrote:


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David A. Prasetya
Ruby on Rails developer
@ http://kiranatama.com - a Ruby on Rails outsourcing company

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On Dec 30, 2009, at 2:12 AM, David A. wrote:

try : 55 11 01 * *

55 23 1 * * …
so you get 5 min. before midnight (not 5 min. before noon)

but i want to run this rake on 1st date of every month.
how can i do it.
pls guide me on this.

Some one pls help me


David A. Prasetya
Ruby on Rails developer
@ http://kiranatama.com - a Ruby on Rails outsourcing company

But to get the help that you seem to be asking for, you’ll have to
give a bit more information.

Ah! I overlooked the ‘whenever’ gem. Since I found that I have that
gem installed (although I can’t recall when or why), the docs are
really sparse and the code doesn’t seem to know how to cope with a
time or frequency option that will do what you want. In particular,
lib/outputs/cron.rb says that the :at option can’t be used in this case:

every :month do
command “something”
end

gives:

@monthly something

but trying to get what you want with:
every :month, :at => ‘11:55pm’ do
command “something”
end

or even:
every :month do
command “something”, :at => ‘11:55pm’
end

appears to just give (from line 41):
ArgumentError: comparison of Time with 0 failed
although I would have expected (from line 42):
You cannot specify an ‘:at’ when using the shortcuts for times.

I can get this error if I try something like:
every :month, :at => 1 do
command “something”
end
or even:
every :month do
command “something”, :at => 1
end

There seems to be a bug in lib/outputs/cron.rb:41 where @at > 0
appears. The @at might be a 0, but is more likely a Time returned
from Chronic.parse on line 11.

Now, the particulars of using:
every :month do … end
to get a crontab line with:
@monthly
might not be exactly what you want since (at least on Mac OS X) the
man page says:
string meaning


@monthly Run once a month, “0 0 1 * *”.

Of course, that doesn’t really get you much closer to forcing: “55 23
1 * * …”

I think that you might have to change the behavior in lib/outputs/
cron.rb to shift from the "@monthly " to the "0 0 1 * * " syntax when
given :at, but also probably adjust the way that the job is created
and stuffed into the @jobs hash.

In the course of thinking about where and how to make the change which
would permit one of the nice syntaxes above, I realized that you could
say:
every 1.month, :at => Time.parse(‘01 23:55’) do
command ‘something’
end
since the parse_time function only looks at the #min, #hour, and #day
methods of the given Time:
55 23 1 * * something

It’s a feature of Time.parse to fill-in with parts of the current date/
time when bits are missing:
Time.parse(‘01 23:55’)
=> Tue Dec 01 23:55:00 -0500 2009

-Rob

Rob B.

http://agileconsultingllc.com
[email protected]

http://gaslightsoftware.com/
[email protected]

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