Shell Programming and Scripting

If you want alternate Mondays, you need to pass two tests:-The first test can be checked easily with the value from date +%u or date +%A
For the other, use date +%W and test if it's odd like this:-

Code:

((odd_or_even=`date +%W`%2))

This will give the remainder so you can tell odd or even easily, then:-

Code:

if [ $odd_or_even -eq 0 ]
then
    : # This is an even week
else
    : # This is an odd week
fi

Schedule the job every day and these tests will handle your requirement. Of course, you have to consider how to run the script late if there has been an operational problem, perhaps with a FORCE flag.

You can therefore consolidate it all like this:-

Code:

if [ \( `date +%A` = Monday -a $((`date +%W`%2)) -eq 0 \) -o "$FORCE" = "Y" ]
then
   : # This is an even week Monday or forced run
else
   : # This is an odd week or not a Monday and not forced.
fi

I hope that this helps.



Robin
Liverpool/Blackburn
UK




I hope that this helps.

If i want to run on Friday's, i have to put Friday there rght,
I need to run the scripts on alterante fridays not on EVEN or ODD Fridays..
For eaxmple, for Jan , I have to run the script on 1/3, 1/17, 1/31 and 2/14 ,
If you run the script on Odd fridays , it will run on 1/3, 1/17, 1/31,2/7 not on 2/14.

---------- Post updated at 03:23 PM ---------- Previous update was at 03:22 PM ----------

If i want to run on Friday's, i have to put Friday there rght,
I need to run the scripts on alterante fridays not on EVEN or ODD Fridays..
For eaxmple, for Jan , I have to run the script on 1/3, 1/17, 1/31 and 2/14 ,
If you run the script on Odd fridays , it will run on 1/3, 1/17, 1/31,2/7 not on 2/14.

---------- Post updated at 03:26 PM ---------- Previous update was at 03:23 PM ----------

If i want to run on Friday's, i have to put Friday there rght,
I need to run the scripts on alterante fridays not on EVEN or ODD Fridays..
For eaxmple, for Jan , I have to run the script on 1/3, 1/17, 1/31 and 2/14 ,
If you run the script on Odd fridays , it will run on 1/3, 1/17, 1/31,2/7 not on 2/14.

Try it out. Even or odd in this sense has nothing to do with the day of the month. It is the number of weeks since a startpoint.

And yes, change Monday to Friday if you want it to run on Fridays.

Hi Perderabo,
I ran the above script, the log says as below, it doesnt find ./datecalc, this is perl server

Alternate_Friday.ksh[7]: ./datecalc: not found
today is not Tuesday

Is my way in post 8 not suitable?

Please let me know.


Thanks,
Robin

I used this below

Code:

alias datecalc=./datecalc


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

        echo today is Tuesday

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

, Output says
Alternate_Friday.ksh[28]: ./datecalc: not found

Is datecalc in your current directory?

Do you have any queries for my suggestions?


Robin