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Alternate mondays to run the script

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# 1  
Old 02-06-2014
Alternate mondays to run the script
I need to run a script every other monday (alternate mondays) , Can anyone has logic to put into timer script.

We are using below logic to run scripts every day
Code:
daywk_is=$(date "+%u")

if	[[ ${daywk_is} -eq 1 ]]

then

1=monday, 2=tuesday, 3=wed, 4=thr, 5=fri, 6=sat, 7=sun

can anyone have idea on this
# 2  
Old 02-06-2014
What's your system?
# 3  
Old 02-06-2014
The easiest would be to use a flag and the logic is:
Code:
if FLAG present
then
   remove FLAG
else
  execute code
  add FLAG
endif

...
Comments
Up to you to decide if the flag is added after execution of job or at first execution by cron ...
Just giving you the idea
Last edited by vbe; 02-06-2014 at 12:32 PM.. Reason: comments
# 4  
Old 02-06-2014
Some of you old timers may remember my datecalc script. It makes date arithemetic easy.

Code:
#! /bin/ksh

#    $
#    $
#    $ cal 1 1973
#        January 1973
#    Su Mo Tu We Th Fr Sa
#        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
#
#    $ ./datecalc -j 1973 1 1
#    41683
#    $
#
#  So now I know that modified julian day 41683 was a Monday in the
#  distant past.
MasterMonday=41683
alias datecalc=./datecalc

year=$1
month=$2
day=$3
today=$(datecalc -j $year $month $day)
if (( ((today-MasterMonday)%7) == 0 )) ; then
        echo today is Monday

        # nweeks is the number of weeks since MasterMonday
        ((nweeks=(today-MasterMonday)/7))
        if ((nweeks%2)) ; then
                echo this is an odd Monday
        else
                echo this is an even Monday
        fi
else
        echo today is not Monday
fi
exit 0

And to test it out.
Code:
$ cal
   February 2014
Su Mo Tu We Th Fr Sa
                   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

$ ./monday2 2014 2 3
today is Monday
this is an even Monday
$ ./monday2 2014 2 10
today is Monday
this is an odd Monday
$ ./monday2 2014 2 17
today is Monday
this is an even Monday
$ ./monday2 2014 2 24
today is Monday
this is an odd Monday
$ ./monday2 2014 2 4
today is not Monday
$ ./monday2 2014 2 2
today is not Monday
$
$

This User Gave Thanks to Perderabo For This Post:
Yoda
# 5  
Old 02-06-2014
Your idea is good:
because each week has 7 (uneven) days, the day-of-the-week is alternating between even and uneven.
When you divide by 2 and take the remainder, it will alternate between 0 and 1
Code:
daywk_is=$(date "+%u")

if [[ $(( $daywk_is % 2 )) -eq 1 ]]
then

# 6  
Old 02-06-2014
Quote:
Originally Posted by MadeInGermany
Your idea is good:
because each week has 7 (uneven) days, the day-of-the-week is alternating between even and uneven.
When you divide by 2 and take the remainder, it will alternate between 0 and 1
Code:
daywk_is=$(date "+%u")

if [[ $(( $daywk_is % 2 )) -eq 1 ]]
then

Your code looks like it would run the script every Monday, Wednesday, Friday, and Sunday.

**edit**
Actually I was not exploiting the fact that weeks have an odd number of days. I converted days to weeks. Then I depended on every other week number being odd. I see your point though. I can simplify my code by expoiting the odd number of days per week.
Code:
#! /bin/ksh

alias datecalc=./datecalc

year=$1
month=$2
day=$3
if [[ $(datecalc -D $year $month $day) = "Monday" ]] ; then

        echo today is Monday

        today=$(datecalc -j $year $month $day)
        if ((today%2)) ; then
                echo this is an odd Monday
        else
                echo this is an even Monday
        fi
else
        echo today is not Monday
fi
exit 0

And testing it...
Code:
$ ./monday2b 2014 2 3
today is Monday
this is an odd Monday
$ ./monday2b 2014 2 10
today is Monday
this is an even Monday
$ ./monday2b 2014 2 17
today is Monday
this is an odd Monday
$ ./monday2b 2014 2 24
today is Monday
this is an even Monday

I have reversed which Monday's are considered even between the two scripts but that was arbritrary anyway.
Last edited by Perderabo; 02-06-2014 at 04:35 PM..
# 7  
Old 02-06-2014
For mondays every other week try also
Code:
T=$(date +"%u%W")
[[ $((T % 2)) -eq 1 ]] && [[ $T -lt 200 ]] && echo OK || echo NOK
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