KSH Function

[santhas]

Hi Scripting Gurus,

I got this script from internet. Script is fine when I run as a stand alone. I need to embed it into my script as a function to get yesterday/day before yesterday and so on... But it fails when called as function.
*********************************************************
#! /bin/ksh
# Get yesterday's date in YYYY-MM-DD format.
# With argument N in range 1..28 gets date N days before.
OFFSET=${1:-1}

case $OFFSET in
*[!0-9]* | ???* | 3? | 29) print -u2 "Invalid input" ; exit 1;;
esac

eval `date "+day=%d; month=%m; year=%Y`
typeset -Z2 day month
typeset -Z4 year

# Subtract offset from day, if it goes below one use 'cal'
# to determine the number of days in the previous month.
day=$((day - OFFSET))
if (( day <= 0 )) ;then
month=$((month - 1))

if (( month == 0 )) ;then
year=$((year - 1))
month=12
fi

set -A days `cal $month $year`
xday=${days[$(( ${#days[*]}-1 ))]}
day=$((xday + day))
fi
print $month/$day/$year
***********************************************
Stand alone:
bash-3.00# ./yesterday_date.ksh 2
11/05/2007

Inside function:
yesterday()
{
......Above script lines.....
}
}
yesterday 2

bash-3.00# ./yesterday_date.ksh
./yesterday_date.ksh[14]: day - OFFSET: bad number

Could someone shed some light here?

Thanks in advance

 

[PHV]

As you use bash I assume you have the GNU date date command and thus:
date --date '2 days ago'

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

 

[santhas]

Sorry, I am not using Gunu date. It's Solaris.

 

[columb]

PHV is too modest to mention his excellent faq80-4800 which covers this.

Ceci n'est pas une signature
Columb Healy