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  #1 (permalink)  
Old 01-03-2009
cjjoy cjjoy is offline
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Posts: 12
problem with shell variable's scope

Hi,
I am stuck while developing a shell sub-routine which checks the log file for "success" or "failure". The subroutine reads the log file and checks for key word "success", if found it set the variable (found=1). It returns success or failure based on this variable.

My problem is, I can see the variable being set to 1 (success scenario) but once it comes outside the while loop the value is reset to 0.
Here is the my logCheck function, please let me know where I am wrong.

function logCheck
{
found=0; #sets to 1 if "success" is found

cat ${OUTPUT_LOG} |
while read line
do
temp=`echo $line|grep "${SUCCESS_MESSAGE}"`
if [ $? -eq 0 ];then
found=1 <-- value is 1 here
echo "string is found"
echo "found value inside while is : $found"
fi
done

echo "found value outside while is $found" <-- found is 0 in all case
if [ $found = 1 ];then
return $SUCCESS;
else
return $FAILURE
fi
}


//output for success scenario:
string is found
found value inside while loop : 1
found value outside while loop is 0
  #2 (permalink)  
Old 01-03-2009
cfajohnson's Avatar
cfajohnson cfajohnson is online now Forum Advisor  
Shell programmer, author
  
 

Join Date: Mar 2007
Location: Toronto, Canada
Posts: 2,310
Quote:
Originally Posted by cjjoy View Post
Hi,
My problem is, I can see the variable being set to 1 (success scenario) but once it comes outside the while loop the value is reset to 0.

In all shells except ksh, all segments of a pipeline are executed in subshells.
Quote:
Here is the my logCheck function, please let me know where I am wrong.

Please put code inside [code] tags.
Quote:
Code:

function logCheck

The standard syntax for defining a function is:

Code:
logCheck()
Quote:
Code:

{
found=0; #sets to 1 if "success" is found

     cat ${OUTPUT_LOG} |

UUOC.
Quote:
Code:
     while read line
      do
           temp=`echo $line|grep "${SUCCESS_MESSAGE}"`

UUOG.

Use a case statement rather than an external command:

Code:
case $line in
     *"${SUCCESS_MESSAGE}"*) found=1
               echo "string is found"
esac
Quote:
if [ $? -eq 0 ];then
found=1 <-- value is 1 here
echo "string is found"
echo "found value inside while is : $found"
fi
done

echo "found value outside while is $found" <-- found is 0 in all case
if [ $found = 1 ];then
return $SUCCESS;
else
return $FAILURE
fi
}


//output for success scenario:
string is found
found value inside while loop : 1
found value outside while loop is 0

Last edited by cfajohnson; 01-04-2009 at 05:46 PM..
  #3 (permalink)  
Old 01-04-2009
cjjoy cjjoy is offline
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Join Date: Jan 2009
Posts: 12
Thanks a lot Johnson.. have incorporated the changes and its working fine now...
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