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How to Set up a cronjob On 4th Sunday of every Month?

 
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# 1  
Old 07-12-2010
How to Set up a cronjob On 4th Sunday of every Month?
How to Set up a cronjob which will run On 4th Sunday of every Month at 8:00 PM Smilie
# 2  
Old 07-12-2010
There is much variety in cron. Please post your Operating System and version.
# 3  
Old 07-12-2010
YMMV:
Code:
0 20 * * * [ `date +%d` -eq `cal | nawk 'FNR==3 {i=(NF<7)?1:0}FNR==(6+i){print $1}'` ] && doMyScript

Last edited by vgersh99; 07-12-2010 at 11:29 AM..
# 4  
Old 07-12-2010
@vgersh99

Interesting idea, but I think that will only work if the first of the month is a Sunday.
For this month it finds the 3rd Sunday.

Code:
cal
   July 2010
 S  M Tu  W Th  F  S
             1  2  3
 4  5  6  7  8  9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

cal | awk 'FNR==6{print $1}'
18

# 5  
Old 07-12-2010
Quote:
Originally Posted by methyl
@vgersh99

Interesting idea, but I think that will only work if the first of the month is a Sunday.
For this month it finds the 3rd Sunday.

Code:
cal
   July 2010
 S  M Tu  W Th  F  S
             1  2  3
 4  5  6  7  8  9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

cal | awk 'FNR==6{print $1}'
18

Thanks, I've also noticed this and fixed the code.
Good catch.
# 6  
Old 07-12-2010
My beautifully long-winded way of finding the same figure.
There has to be a better way.
Tested for various easy and awkward months.

Code:
# Day of fourth Sunday based on "cal"
for TRY in "02 2004" "02 2009" "02 2010" "07 2010" "08 2010" "09 2010"
do
        echo "======================"
        cal ${TRY}
        cal ${TRY} | sed -n '3,$ p'|cut -c1-2|grep -v "  "|head -4|tail -1
        echo "======================"
done


======================
   February 2004
 S  M Tu  W Th  F  S
 1  2  3  4  5  6  7
 8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29

22
======================
======================
   February 2009
 S  M Tu  W Th  F  S
 1  2  3  4  5  6  7
 8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28


22
======================
======================
   February 2010
 S  M Tu  W Th  F  S
    1  2  3  4  5  6
 7  8  9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28

28
======================
======================
   July 2010
 S  M Tu  W Th  F  S
             1  2  3
 4  5  6  7  8  9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

25
======================
======================
   August 2010
 S  M Tu  W Th  F  S
 1  2  3  4  5  6  7
 8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31

22
======================
======================
   September 2010
 S  M Tu  W Th  F  S
          1  2  3  4
 5  6  7  8  9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30

26
======================



UPDATE: Just tried "vgersh99" revised version and is gets the same answer in much less code!

Code:
cal | nawk 'FNR==3 {i=(NF<7)?1:0}FNR==(6+i){print $1}'

Last edited by methyl; 07-12-2010 at 11:57 AM.. Reason: UPDATE ...
# 7  
Old 08-19-2010
Code:
1 0 22-28 * 0 /path/to/script.sh

minute=1
hour=0
date range=22-28
month=all
day of week=sunday

the 4th Sunday of every month always falls in that date range.
Last edited by Yogesh Sawant; 08-27-2010 at 09:44 AM.. Reason: added code tags
 
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