crontab 4th Tuesday of month

[Charlie Brune]

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