crontab 4th Tuesday of month

[Mark LaPierre]

On 07/29/2012 02:33 PM, Charlie Brune wrote:
> On 07/28/2012 08:20 AM, Tony Molloy wrote:
>> On Saturday 28 July 2012 12:03:09 Frank Murphy wrote:
>>> 15 18 22-28 * 2 /command
>>>
>>> I thought the last tuesday would be covered by above.
>>> But it has run everyday since 22nd.
>>>
>>> Have googled a bit:
>>> http://hintsforums.macworld.com/showthread.php?t=25110
>>> plus other crontab pages.
>>>
>>>
>> http://hintsforums.macworld.com/member.php?s=2584787478dc5ab0791da9
>>> ba8d650aa5&u=28924 15 18 22-28 * * test 'date +\%a' != Tue ||
>>> /command
>>> Am uncertain if above would work ootb.
>>>
>>> man crontab (22 September 2010) doesn't shed light on this.
>>>
>> Try the following
>>
>> eg. this picks out the first sunday of the month
>>
>> 07 03 1-7 * * test `date +\%a` = Sun && /usr/local/bin/backup-full
>>
>> So
>>
>> 15 18 22-28 * * test 'date +\%a' = Tue && command
>>
>> Tony
> Not sure if your syntax will work. If it doesn't, here's what has worked
> for me:
>
> 23 1 22-28 * * [ `date +\%a` == "Tue" ] && /usr/local/bin/my-script
>
> Charlie

If you are firing off a script with this why don't you build the logic 
into the script?  Let cron fire off the script every Tuesday.  The 
script can determine if it's the correct Tuesday and take whatever 
action you want if it is or exit if it isn't.

-- 
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    ^ ^  Mark LaPierre
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