OT: cron help

g geleem at bellsouth.net
Fri Dec 13 04:35:35 UTC 2013



On 12/12/2013 09:10 PM, Bill Davidsen wrote:
> Gregory Hosler wrote:
>> On 12/13/2013 09:02 AM, T.C. Hollingsworth wrote:
>>> On Thu, Dec 12, 2013 at 3:31 PM, Mike Wright
>>> <mike.wright at mailinator.com> wrote:
>>>> Hi all,
>>>>
>>>> I'm trying to execute a command once a minute.  As a test I
>>>> place this:
>>>>
>>>> 0,1 * * * * /bin/ping -c1 w.x.y.z > /dev/null 2>&1
>>>>
>>>> in /etc/cron.d/everyMinute
>>>>
>>>> but nothing is happening.  I've done "service crond restart".
>>>>
>>>> Any ideas?
>>>
>>> That "0,1" tells cron to run your command at N:00 and N:01 every
>>> hour. You want "0-59" instead.
>>
>> or */1
>>
>> e.g.
>>
>> */1 * * * * /bin/ping -c1 w.x.y.z > /dev/null 2>&1
>>
>> All the best,
>>
> Don't think that does what you want, */5 is every 5th time, but /1 is
> a NOP, I think. All asterisks should be once a minute.


   * * * * *  command to execute
   | | | | |
   | | | | |
   | | | | |
   | | | | +--- day of week (0 - 7) 0 to 6 are Sunday to Saturday,
   | | | |      or use names;  7 is Sunday, the same as 0
   | | | +----- month (1 - 12)
   | | +------- day of month (1 - 31)
   | +--------- hour (0 - 23)
   +----------- min (0 - 59)

therefore;

    1 * * * *

should be use.


using a </> key is to indicate skip period as in;

   */2

would be every 2 hours.


i do not know what op's

   0,1

would do as i have never seen <,> used in any cron commands.

-- 

peace out.

in a world with out fences, who needs gates.

tc.hago.

g
.



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