Help Requested - how to find last Sunday's date if a date is given

Hi All,

I have got a requirement for my project. It is as follows,

If I pass today's date as a parameter to a command/script, it should derive the previous Sunday's date. ( ie if 201200307 is passed, the command/script should return 20120304).

Is there a way we can do it ? I would prefer to use a command instead of a script. Any thoughts will be appreciated.

Thanks
Freddie

Thanks for taking a glance of the issue.

I have found a solution for this as below,

export DAYS_AGO=`date +%w`
echo $DAYS_AGO
export SUB_DATE=`date -d "-$DAYS_AGO day" "+%Y%m%d"`
echo "P_SUB_DATE=$SUB_DATE" >>$COMMON_TMP/CPMGDynamicDateFile.txt

I am not sure whether this command will work fine for all the dates of a month (like for e.g: 20120302). Will it give the correct date as expected.

Any thoughts will be much appreciated.

Thanks
Freddie

Thanks for posting your solution.

The date command is *way* more powerful than having to go through all of that though: