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Full Discussion: How to setup cronjob 3rd sunday of every month?
Top Forums Shell Programming and Scripting How to setup cronjob 3rd sunday of every month? Post 302922893 by RavinderSingh13 on Wednesday 29th of October 2014 01:05:50 AM
Old 10-29-2014
Hello netdbaind,

I agree with vbe's solution like we can run script on each Sunday and check either it is 3rd Sunday or not.
Following code may help you to get the 3rd Sunday with explaination.

Code:
cal | awk 'NR==3 {i=(NF<7)?1:0}NR==(5+i){print $1}'

Logic behind the code is if we need to get any 3rd occurance of a day(Sunday in this case) in a month it should come in 5th line of command cal output, but in case a month's starting day is not Sunday so number of fields NF will be less than 7 then. So by condition NF<7 we are checking the same and assigning a value of variable i. Now if number of fields are less than 7 means 1st day of a month is not Sunday so we need to jump to next line which is 6th line of command cal so we are doing here NR==(5+i) and checking if condition is true and printing it.

Hope this helps.

Thanks,
R. Singh
Last edited by RavinderSingh13; 10-29-2014 at 02:57 AM.. Reason: fine tune the lines
These 2 Users Gave Thanks to RavinderSingh13 For This Post:
netdbaind zhengzfand
 

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LEARN ABOUT OPENSOLARIS

cal

cal(1)								   User Commands							    cal(1)

NAME

       cal - display a calendar

SYNOPSIS

       cal [ [month] year]

DESCRIPTION

       The  cal  utility writes a Gregorian calendar to standard output. If the year operand is specified, a calendar for that year is written. If
       no operands are specified, a calendar for the current month is written.

OPERANDS

       The following operands are supported:

       month	Specify the month to be displayed, represented as a decimal integer from 1 (January) to 12 (December). The default is the  current
		month.

       year	Specify  the year for which the calendar is displayed, represented as a decimal integer from 1 to 9999. The default is the current
		year.

ENVIRONMENT VARIABLES

       See  environ(5) for descriptions of the following environment variables that affect the execution of cal: LANG, LC_ALL, LC_CTYPE,  LC_TIME,
       LC_MESSAGES, and NLSPATH.

       TZ    Determine the timezone used to calculate the value of the current month.

EXIT STATUS

       The following exit values are returned:

       0     Successful completion.

       >0    An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       calendar(1), attributes(5), environ(5), standards(5)

NOTES

       An  unusual calendar is printed for September 1752. That is the month 11 days were skipped to make up for lack of leap year adjustments. To
       see this calendar, type:

	 cal 9 1752

       The command cal 83 refers to the year 83, not 1983.

       The year is always considered to start in January.

SunOS 5.11							    1 Feb 1995								    cal(1)
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