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Full Discussion: Scheduling a command to run every 3 days through cron
Top Forums Shell Programming and Scripting Scheduling a command to run every 3 days through cron Post 302344992 by jim mcnamara on Tuesday 18th of August 2009 07:07:41 AM
Old 08-18-2009
The problem with using DOW is that there are 7 days - plus sunday may not be day 0 depending on your locale. 7 does not divide evenly by 3.

If you literally want every third day try setting up a daily cron entry that checks for "thirdness"
Code:
$(date +%s)/86400

is the number of days since Jan 1 1970. # of days % 3 == 0 means it is a day divisible evenly by three.
This trick works for any weird number of days that don't track well as a DOW or a fixed day in the month.


Code:
[[ $(( ($(date +%s)/86400) % 3   )) -eq 0 ]] && /home/me/myscript.sh

Last edited by jim mcnamara; 08-18-2009 at 08:21 AM..
 

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hdate_struct

hdate_struct(3) 						libhdate C language						   hdate_struct(3)

NAME

       hdate_struct -

       libhdate Hebrew date struct

SYNOPSIS

       #include <hdate.h>

   Data Fields
       int hd_day
       int hd_mon
       int hd_year
       int gd_day
       int gd_mon
       int gd_year
       int hd_dw
       int hd_size_of_year
       int hd_new_year_dw
       int hd_year_type
       int hd_jd
       int hd_days
       int hd_weeks

Detailed Description
       libhdate Hebrew date struct

Field Documentation
   int hdate_struct::hd_day The number of day in the hebrew month (1..31).
   int hdate_struct::hd_mon The number of the hebrew month 1..14 (1 - tishre, 13 - adar 1, 14 - adar 2).
   int hdate_struct::hd_year The number of the hebrew year.
   int hdate_struct::gd_day The number of the day in the month. (1..31)
   int hdate_struct::gd_mon The number of the month 1..12 (1 - jan).
   int hdate_struct::gd_year The number of the year.
   int hdate_struct::hd_dw The day of the week 1..7 (1 - sunday).
   int hdate_struct::hd_size_of_year The length of the year in days.
   int hdate_struct::hd_new_year_dw The week day of Hebrew new year.
   int hdate_struct::hd_year_type The number type of year.
   int hdate_struct::hd_jd The Julian day number
   int hdate_struct::hd_days The number of days passed since 1 tishrey
   int hdate_struct::hd_weeks The number of weeks passed since 1 tishrey
Author
       Generated automatically by Doxygen for libhdate C language from the source code.

Version 1.4							  Sun Jan 8 2012						   hdate_struct(3)
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