nixCraft

parmarjm · #1 (**permalink**) 08-04-2009, 09:24 PM

Hi
I am new to Unix.
I am running Sun aix as an o/s.

I have a requirement where need to create a file (.txt) using shell script.
In this file I have to pass /compute `date` in such a way that it gives
start dt = 032009
end = 032008

below is the script I have created which creates a desired file and populates start date as current date but dont know how to compute current date (minus one month) and end_dt as current date minus 12 months.

my script is as below:

Code:

#!/bin/ksh
rm stage3sg.txt
if [ ! -s stage3sg.txt ]
then
echo "Creating File"
cat << EOF > stage3sg.txt
echo start_dt `date "+%m%Y"`
EOF
fi

above script creates file stage3sg.txt.
When you check contents of stage3sg.txt is has
echo start_dt 042009 -- as output.

I need to get
start_dt 032009
end_dt 032008

Please guide me,
any help is appreciated.
Thanks
J

kasimani · #2 (**permalink**) 09-04-2009, 01:12 PM

use the below one

Code:

rm -f stage3sg.txt
if [ ! -s stage3sg.txt ]
then
echo "Creating File"
echo start_dt `date -d "1 month ago" "+%m%Y"` >> stage3sg.txt
year=`date -d "1 year ago " "+%Y"`
date=`date -d "1 day ago" "+%d"`
echo end_dt $date$year >> stage3sg.txt
echo Year=$year
echo DATE=$date
echo 
fi

parmarjm · #3 (**permalink**) 10-04-2009, 12:56 AM

To Kashimani,

Hi Thanks for your response.
The script you have provieded didn't went thru.

here is my version of script works:

Code:

#!/bin/ksh
MONTH=`date +%m`
LAST_MONTH=$((`date +%m` - 1))

YEAR=`date +%Y`
LAST_YEAR=$((`date +%Y` -1))

if [ $LAST_MONTH -eq "0" ]
then
LAST_MONTH=12
YEAR=$LAST_YEAR
LAST_YEAR=$(($YEAR-1))
echo "If current month is January then last_month is $LAST_MONTH"
echo "and start_date year is $YEAR and end_dt year becomes $LAST_YEAR"
else
LAST_MONTH=$LAST_MONTH
echo "If current month is not January then last month is $LAST_MONTH"
fi

rm stage3sg.txt
if [ ! -s stage3sg.txt ]
then
echo "Creating File"
cat << EOF > stage3sg.txt

#MONTH=`date +%m`
#LAST_MONTH=$((`date +%m` -1))
#YEAR=`date +%Y`
#LAST_YEAR=$((`date +%Y` -1))
 start_dt $LAST_MONTH$YEAR
 end_dt $LAST_MONTH$LAST_YEAR

#echo start_dt `date "+%m%Y"`
EOF
fi

Posting here so other ppl can benefit

Thanks
J

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