[clue-tech] Re: predicting 'at' files

[dperkins at frii.com]

There is probably no reason to store to disk.  "At" only runs each request
once, and if I remember correctly, "at" does not remember any requests
from before a reboot.

The number looks like an "at" job number.  You can pass it to atrm to kill
an at job, for instance.


>>> This is Fedora Core 2.
>>>
>>> I have a user with an upcoming 'at' job:
>>> $ atq
>>> 28      2005-10-17 03:38 a matchingmoms
>>>
>>> I have these files:
>>> $ ls -l /var/spool/at
>>> total 8
>>> -rwx------  1 matchingmoms users  2317 Sep 21 03:39
>>> a0001c011f407a
>>> drwx------  2 daemon       daemon 4096 Oct  4 00:35
>>> spool
>>>
>>> I've looked in the contents of a0001c011f407a and saw
>>> nothing that would indicate when the job is scheduled.
>>> How does 'at' know when to run this job?
>>
>> Did you have a look at the man page for at(1)?  This is
>> in that man page:
>>
>>        atq     lists  the user's pending jobs, unless the
>> user is the superuser; in that case,
>>                everybody's jobs are listed.  The format of
>> the output lines (one for each job)
>>                is: Job number, date, hour, job class.
>>
> I did look at the man page.  And, atq performs as
> advertised.  I was just curious as to implementation.  I
> don't understand how my machine "knows" or "remembers"
> that job is to run at 3:38 on October 17.  I assume that
> information must be written to disk somewhere, I just
> can't find it.
> If a0001c011f407a is a hexadecimal number, its decimal
> equivalent is 45036116551614586.  I can't figure out what
> that might mean.
>
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