> 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. > > 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.
Thanks To all who answered. I came up with the following function since apparantly it can't be done with just the date command.:
NEXTMONTH=`/bin/date --date="next month" +%m`
g_1snm()
{
if [ $NEXTMONTH == `date --date="$1 sunday" +%m` ]
then
a=`expr $1 - 1`
LASTSUNDAYTHISMONTH=`date --date="$a sunday" +%Y%m%d`
else
g_1snm `expr $1 + 1`
fi
}
g_1snm 1
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