cronjobs

Ed Kapitein ed at kapitein.org
Mon Jun 1 00:28:59 CEST 2009


Ben,

Than you so much, this really is what i needed.
If i have put it together with some scripts i will put it on the wiki.
This way we can wake-up our FR when a cron job is due.

Again thanks a lot.

Kind regards,
Ed

Ben Wong wrote:
> Sure, I've whipped up an example for you based on the documentation
> located here:  http://search.cpan.org/dist/Schedule-Cron/lib/Schedule/Cron.pm
>
> --Ben
>
> #!/usr/bin/perl -w
> use Schedule::Cron;
>
> # Dummy subroutine, to make Cron constructor happy.
> sub dispatcher {
>   print "ID:   ",shift,"\n";
>   print "Args: ","@_","\n";
> }
>
> my $cron = new Schedule::Cron(\&dispatcher);
>
> # You can print out a date from a single line...
> $line='*/5 3 * * 5,6';
> print "The crontab entry '$line' will be next executed on ";
> print scalar(localtime($cron->get_next_execution_time($line)));
> print "\n\n";
>
> # ...or you can iterate through a crontab file.
> $cron->load_crontab("/etc/crontab");
>
> my @entries = $cron->list_entries();
> foreach $e (@entries) {
>     # time in original cron format, "*/5 * * * *"
>     print $$e{'time'} . "\t";
>
>     my $nexttime=$cron->get_next_execution_time($$e{'time'});
>
>     # time in seconds since the epoch
>     print $nexttime . "\t";
>
>     # time in human readable format
>     print scalar(localtime($nexttime)) . "\t";
>
>     # the rest of the line from the crontab file
>     @command = $$e{'args'};
>     print $command[0][0];
>     print "\n";
> }
>
> # END OF SCRIPT
>
>
>
> On Sat, May 30, 2009 at 6:29 PM, Ed Kapitein <ed at kapitein.org> wrote:
>   
>> Ben Wong wrote:
>>     
>>> Did  you try  $cron->get_next_execution_time($cron_entry,[$ref_time]) ?
>>>
>>> --Ben
>>>
>>>       
>> No, i had no idea i could !
>> But now that i try it i get:
>> Can't call method "get_next_execution_time" on an undefined value at
>> ./ff.pl line 11.
>>
>> Can you make an example perl script? a real simple one?
>>
>> Thanks !
>>
>> Kind regards,
>>
>> Ed
>>
>>
>>     
>>> On Sat, May 30, 2009 at 4:21 PM, Ed Kapitein <ed at kapitein.org> wrote:
>>>
>>>       
>>>> Alexey Feldgendler wrote:
>>>>
>>>>         
>>>>> On Fri, 29 May 2009 15:49:27 +0200, Ed Kapitein <ed at kapitein.org> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>           
>>>>>> i need a script/program that will read a crontab line
>>>>>> ( * * * * * some_action) and output the date and time the job will run.
>>>>>>
>>>>>> Does anyone know of such a tool?
>>>>>> This way i can un-suspend the FR a few seconds prior to the start of
>>>>>> that cron job.
>>>>>>
>>>>>> I already made a script that sort of works, but it is limmited at best
>>>>>> and i hate to reinvent the wheel again.
>>>>>>
>>>>>>
>>>>>>             
>>>>> You might want to look at this:
>>>>> http://search.cpan.org/dist/Schedule-Cron
>>>>>
>>>>>
>>>>>           
>>>> Hi Alexey and all the others
>>>>
>>>> I did take a look at perl, but i am a real perl noob.
>>>>
>>>> This is what i have so far:
>>>>
>>>> #!/usr/bin/perl
>>>> use Config::Crontab
>>>> $event = new Config::Crontab::Event( -data => '*/5 3 * * 5,6 /bin/blech' );
>>>> print $event->minute . "\n";
>>>> print $event->hour . "\n";
>>>> print $event->dom . "\n";
>>>> print $event->datetime . "\n";
>>>> print $event->command . "\n";
>>>> print $event->dump . "\n";
>>>>
>>>> And if i run that i get:
>>>>
>>>> */5
>>>> 3
>>>> *
>>>> */5 3 * * 5,6
>>>> /bin/blech
>>>> */5 3 * * 5,6 /bin/blech
>>>>
>>>> Perhaps i am missing the obvious here.
>>>>
>>>> Is there someone out there who can make a script that can read a
>>>> crontab line and give the time and date  of the next time it will be
>>>> executed ?
>>>> output in the form:
>>>> secs_since_epoch,yyyy-mm-dd,hh:mm,command would be *great*
>>>>
>>>> Many thanks in advance,
>>>>
>>>> Ed
>>>>
>>>>
>>>>
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>>>>
>>>>         
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