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How do I execute and capture the return value of a C executable from a UNIX Kshell Script?

Last Modified: 2013-12-26
I am trying to run a C executable from within a Korn Shell Unix script.  The C executable is to create a csv file and returns 0, 1, or -1 depending on success, warning, or failure.  I am able to execute the code successfully from Kshell because the csv file is created. But I am unable to capture the return code (0,1,or -1) in a Kshell variable for testing purposes.  Below is a code snippet I am using now that successfully runs and executes the C code but does not capture the return code.  Parameters passed to the C code (named " cexecutable" for purposes of discussion) are a variable $harness and output directory "/home/user/me/outdir/":

   output=`/home/user/me/cexecutable $harness /home/user/me/outdir/ `
    echo "OUTPUT is = " $output >> $outfile
    if [ $output -eq 0 ]; then
        echo $output " - CSV success!" >> $outfile............
and so on...
$output does not seem to capture the return code...not sure if I have a syntax error or it is a C issue.

Thanks for the help in advance!
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