Script for 3rd last month 1st date and 2nd last month of the last date

[kandir]

Hi,

COuld you pleas ehelp me how to get the 3rd last month's 1st date and 2nd last month of the last date through script.

Ex : - If today is the "1-Feb-2010" then I need the output like

Today is ---> 1-Feb-2010
First day of the 3rd last month --> 1-Nov-2009.
Last day of the 2nd last month --> 31-Dec-2009.

**************************************

I have written a script in the below format but it is failing in whenthe month is 1 (jan) and 3 (March).

Please help me.


day=1
month=01
year=2010

echo "Today is ---> "$day'-'$month'-'$year

lmonth=`expr $month - 2`

if test "$lmonth" = "0"
then
lmonth=12
year=`expr $year - 1`
fi

v_3rd_last_month=`expr $lmonth - 1`

lday=`cal $lmonth $year |awk '$0~/[0-9]/ {print $NF}'|tail -1`

echo "First day of the 3rd last month ---> " 01'-'$v_3rd_last_month'-'$year
echo "Last day of 2nd last month was ---> " $lday'-'$lmonth'-'$year

 

[PHV]

What about this ?
echo "Today is ---> "$day'-'$month'-'$year
lmonth=`expr $month - 2`
if test "$lmonth" -le "0"; then
lmonth=`expr $month + 10`
year=`expr $year - 1`
fi
lday=`cal $lmonth $year |awk '$0~/[0-9]/ {print $NF}'|tail -1`
echo "Last day of 2nd last month was ---> " $lday'-'$lmonth'-'$year
v_3rd_last_month=`expr $lmonth - 1`
if test "$v_3rd_last_month" -le "0"; then
v_3rd_last_month=`expr $lmonth + 11`
year=`expr $year - 1`
fi
echo "First day of the 3rd last month ---> " 01'-'$v_3rd_last_month'-'$year

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[stefanwagner]

Format date without leading 0:

mon=$(date +%-m)

# Use modulo, to avoid negative months:

# +12-3 = +9
nmon=$(((mon+9)%12))

# Still, we need to avoid the month being 0: 

if (( nmon == 0 )) ; then nmon=12; fi
year=$(date +%y)
if (( nmon > 9 )) year=$((year-1)); fi 
# eval is outdated as backticks. 

# combined: 
LC_TIME="en_US.UTF-8" date +%d-%b-%Y -d "$(date +%Y)-10-01"

- STOP -
I remember a simpler approach:

echo "1-"$(date +%b-%Y -d "-3months")

don't visit my homepage:

http://home.arcor.de/hirnstrom/minis/index.html

 

[kandir]

Thanks you very much for your help on this.