Shell Programming and Scripting

Hi,

I have written the following script which will provide the first date of the 3rd previous month and last date of the 2nd previous month but when I change the month for 03 (March) then I am getting the incorrect results.

Ex : - If today is 1 Jan 2010 then the script should provide the 01-Oct-2009 and 30-Nov-2009,
if the today is 1 Feb 2010 then the script should provide the 1-Nov-2009 and 31-Dec-2009,
if today is 1 Mar 2010 then the scrupt should provide the 1 Dec 2009 and 31 Jan 2010,
if today is 1 st Apr then the script should provide the 1-jan-2010 and 28-Feb2010.

In the above scenarios my scruipt is working file except for the month of March...it is not providing the correct year, could you please help me on this.

day=`date '+%d'`
month=1
#month=`date '+%m'`
year=`date '+%Y'`

file_name=' '
file_name_1=' '
file_cnt=0
file_cnt_1=0

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

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`

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
echo
echo "Last day of 2nd last month was ---> " $lday'-'$lmonth'-'$year
echo


OutPuts : -

If I update the month = 1 then

bash-3.00$ check_date3.sh

Today is ---> 15-1-2010

First day of the 3rd last month ---> 01-10-2009

Last day of 2nd last month was ---> 30-11-2009

bash-3.00$

If I update the month = 2 then

bash-3.00$ check_date3.sh

Today is ---> 15-2-2010

First day of the 3rd last month ---> 01-11-2009

Last day of 2nd last month was ---> 31-12-2009

bash-3.00$

If I update the month = 3 then

bash-3.00$ check_date3.sh

Today is ---> 15-3-2010

First day of the 3rd last month ---> 01-12-2009

Last day of 2nd last month was ---> 31-1-2009

bash-3.00$

If I update the month = 4 then

bash-3.00$ check_date3.sh

Today is ---> 15-4-2010

First day of the 3rd last month ---> 01-1-2010

Last day of 2nd last month was ---> 28-2-2010

bash-3.00$

In the above, the outputs for the March month's last day of 2nd last month was shosing wrong...COuld you please help me. especially year!!!!

For a start,

Code:

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

$year in the second echo statement should not be the same variable as the first.