Last Sunday of the Month

[Michael Velez]

> -----Original Message-----
> From: redhat-list-bounces at redhat.com 
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Pete Nesbitt
> Sent: Tuesday, April 05, 2005 12:01 AM
> To: General Red Hat Linux discussion list
> Subject: Re: Last Sunday of the Month
> 
> On Monday 04 April 2005 12:55 pm, Steve Buehler wrote:
> > RHEL ES 3
> > I can't seem to find this about the date command, but that doesn't 
> > mean it can't do it.  I have overlooked things in the past.
> >
> > 1.  Can the date command give you a date for the Last Sunday of a 
> > month?  Or do I have to go through a loop to check each day of the 
> > month to see if it is the last Sunday of the month?
> >
> > 2.  I can do a date --date="last sunday".  Is there a way 
> to tell it 
> > to give me the date of 4 Sundays ago?  I tried date 
> --date="4 sundays 
> > ago" and that didn't do it.
> >
> > Thanks
> > Steve
> 
> 
> Hi,
> You can use -d to request a date by string, but i think it 
> only uses 'next' or 'last'.
> date -d "last month"
> Fri Mar  4 21:00:09 PST 2005
> 
> date -d "next sunday"
> Sun Apr 10 00:00:00 PDT 2005
> 
> You could check if next sunday is the current month:
> date -d "next sunday"|awk ' {print $2} ...does it = $thismonth?
> That would be a lot easier to check than checking every day.
> 
> --

Yes, check if next sunday is the current month but get the date like this:

LASTSUNDAY=`date -d "last sunday"`
NEXTSUNDAY=`date -d "next sunday"`
NEXTSUNDAYMONTH=`date -d "$NEXTSUNDAY" | awk '{print $2}'`

That will allow you to iterate in a while loop with the following (i.e. if
NEXTSUNDAYMONTH is not equal to the current month):

LASTSUNDAY=$NEXTSUNDAY
NEXTSUNDAY=`date -d "$NEXTSUNDAY + 1 week"`      # I guess this line is what
you're looking for
NEXTSUNDAYMONTH=`date -d "$NEXTSUNDAY" | awk '{print $2}'`


When NEXTSUNDAYMONTH is no longer equal to the current month, LASTSUNDAY
will contain the date of the last Sunday of the current month.  

Hope this helps,
Michael