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Accessing variables outside the function

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# 1  
Old 10-20-2009
Accessing variables outside the function
I have the below code to find yesterdays date, In this I want to make MONTH, DAY and YEAR as global variableand use it outside the {}, but I am unable to do so , please assist:

Code:

#!/usr/bin/ksh
date '+%m %d %Y' | 
{ 
read MONTH DAY YEAR
DAY=`expr "$DAY" - $1` 
case "$DAY" in 
0) 
MONTH=`expr "$MONTH" - 1` 
case "$MONTH" in 
0) 
MONTH=12 
YEAR=`expr "$YEAR" - 1` 
;; 
esac 
DAY=`cal $MONTH $YEAR | grep . | fmt -1 | tail -1` 
esac
echo "Yesterday was: $MONTH $DAY $YEAR" 
export MONTH = $MONTH
export DAY= $DAY
export YEAR= $YEAR
}
echo "Yesterday was: $MONTH $DAY $YEAR"

Output I am getting:
Code:
$ ./asOfDate.sh 1
Yesterday was: 10 19 2009
Yesterday was:

# 2  
Old 10-20-2009
Hi mohsin.quazi, because you pipe the date command to the curly braces, it is no longer a code block but a subshell.
i.e. compare the difference between
Code:
date '+%m %d %Y' | 
{ 
read MONTH DAY YEAR
...

and
Code:
{
date '+%m %d %Y' |
read MONTH DAY YEAR
...

The export of variables does not help you since that only works from shell to subshell, not vice versa.

On a different note if you have GNU date, you can do this:
Code:
me@tinybird:~/test$ date '+%m %d %Y'
10 21 2009
me@tinybird:~/test$ date -d yesterday '+%m %d %Y'
10 20 2009

Last edited by Scrutinizer; 10-20-2009 at 08:42 PM..
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