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problem passing unix variable to c

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# 1  
Old 05-13-2010
problem passing unix variable to c
hi,

i am trying to call a unix script in a c program, this unix script will set a flag, the value of which i would like to return to the calling C program. this is the code that i have written.. the get env functions works if i use other env variables set at session level in unix like "JAVA_HOME" or ORACLE_HOME. it seems like there is a problem in reading the varaible that i set in the program. can any one please help.
in c :

Code:
strcpy ( command  , "sh unixscript.sh   ");
			strcat ( command  ,"filename");
			printf ("running shell script  flsps");
		system ( command );
printf ("value of flpsp_hdr flag is %\n", getenv( "flpsp_flag" ));

shell script :
Code:
#!/bin/sh
filename=$1
header_type1="pattern1"
header_type2="pattern2"
a=`grep $header_type1 $filename`


if [  -z "$a" ]
then 
echo "format one is not present"
else
flpsp_flag=a
echo $flpsp_flag
export flpsp_flag
fi
b=`grep $header_type2 $filename`
if [  -z "$b" ]
then 
echo "format two is not present"
else
flpsp_flag=b
echo $flpsp_flag
export flpsp_flag
fi

Moderator's Comments:
Mod Comment Please use code tags
# 2  
Old 05-13-2010
Environment variables don't work that way. Child processes get a copy of yours, and don't actually share it; changes they make aren't reflected in your own process. You'll have to capture its output in other ways, probably by reading its standard output. See man popen.
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