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How to store value from a function and use it?

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Top Forums Shell Programming and Scripting How to store value from a function and use it?
# 1  
Old 06-27-2012
How to store value from a function and use it?
There is one function to calculate previous day value and then touch one file with that date.The problem is i am getting the previous day value but not able to store it in other variable and use it.
Code:
PREVIOUS_DATE_FUNCTION()
{

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 $YEAR | grep . | fmt -1 | tail -1` 
esac 
    PREVIOUS_TEMP_DATE=$YEAR-$MONTH-$DAY
    echo "$PREVIOUS_TEMP_DATE"
}
}


PREVIOUSDATE="`(PREVIOUS_DATE_FUNCTION)`"
   tempfile=CANCEL_FILE_$PREVIOUSDATE

Output i am getting is tempfile=CANCEL_FILE_


Moderator's Comments:
Mod Comment Please view this code tag video for how to use code tags when posting code and data.
# 2  
Old 06-27-2012
And what does echo $PREVIOUSDATE give you?
# 3  
Old 06-27-2012
+ PREVIOUSDATE=2012-06-26
+ echo 2012-06-26
2012-06-26
# 4  
Old 06-27-2012
Do you have access to a database? You could get the date from there and put it into a shell variable. Example using Oracle:
Code:
$ cat x
#!/usr/bin/ksh

eval $(print "select 'YESTERDAY='||to_char(sysdate-1, 'YYYY-MM-DD') as YESTERDAY from dual;" | sqlplus -s / | grep YESTERDAY=)

print "yesterday: $YESTERDAY"

$ x
yesterday: 2012-06-26
$

# 5  
Old 06-27-2012
no please tell me how to save the value in variable and use it, Thanks..!!
# 6  
Old 06-27-2012
See if this works for your shell and system, whatever it is (you never told us):
Code:
$ PREVIOUSDATE=`TZ=XYZ+24 date '+%Y-%m-%d'`
$ echo $PREVIOUSDATE
2012-06-26
$

# 7  
Old 06-27-2012
But when i am using this
Code:
PREVIOUSDATE="`(PREVIOUS_DATE_FUNCTION)`"    tempfile=CANCEL_FILE_$PREVIOUSDATE

I am not getting the output correct...i am only getting
Code:
tempfile=CANCEL_FILE_

but i want
Code:
tempfile=CANCEL_FILE_2012-06-26

Last edited by Franklin52; 06-28-2012 at 04:39 AM.. Reason: fixed code tags
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