finding which week of the current Month 1

[naveenrt]

Hello
I want to run my Backup every Second and Fourth Friday of the month .Is there anyway to find which week is today

For example in May , May 17 will be the Fourth week of thye month and May 1 the first week

Thanks in advance

Naveen

 

[zaxxon]

What about taking "date +%U" for getting the week of the year and just write a script to trigger your backup every 2n week?

ie. something like:

WEEKS=`date +%U` # actual number of week in the year
EVEN=`expr $WEEKS % 2` # divide it through 2 and see if there is a rest

# Unix day 5 is friday (date +%w)

if [[ $EVEN -eq 0 && `date +%w` -eq 5 ]]; then
echo "Backup job is starting..."
else
echo "Nothing to do...zzz"
fi

laters
zaxxon

 

[kozlow]

I think that will run the backup every other week, not the 2nd and 4th week of a month... Since there is no way of telling what week you are in in the current month, we use to create a date file and then check the date against it..
So you can set up the backup to run in crontab every Friday.
In the script check the date:

DATE=`date +%m%d%y`
if [`grep -qx $DATE RUNDATE.lst` -eq 0 ]
then
run backup
else
don't run backup
fi

This is sloppy and you will have to manually set it up for a few years.... But it will work....

Love to see if anyone has a solution....

 

[d3vzero]

Hi Guys,

The following command will give you the two dates you are after. (ie. 2nd and 4th Friday of the current month).

cal | tail +3 | cut -c21-22 | grep "[0-9]" | sed -n '2p;4p'

You can change the day from friday to another by tweaking the cut command, or change the week in the month by tweaking the sed command.

Setup a script to exec via cron every friday, with something like the following verify function to prevent actually executing on the wrong days.

Today=`date +%e`
RunDays=`cal | tail +3 | cut -c21-22 | grep "[0-9]" | sed -n '2p;4p'`
if [[ `echo "$RunDays" | grep $Today` -ne $Today ]]
then # Exit Cleanly
exit 0
fi
# Now running rest of script seeing as its either 1st or 4th Friday of this month.

Hope the above is of some use to you

Best Regards to all.

____________________
Sometimes it pays to stay in bed on Monday, rather than spending the rest of the week debuging Mondays code.

 

[naveenrt]

d3Vzero
Great and Simple Script . This script works for all months. Thanks a lot in helping me out .

The beauty of this script is that it can be customized for any day ( Monday thursday ...etc)

Hats off to you for thinking so simply . I went in to arithmetics to solve this ... wheras you have solved the same with simple Logic

Thanks Again
Naveen

 

[KenCunningham]

............and deserves a star!

 

[d3vzero]

Cheers Ken ....

____________________
Sometimes it pays to stay in bed on Monday, rather than spending the rest of the week debuging Mondays code.