The problem is because of Pipe. There is no wait specified to finish "abc.sh".
open(OUTPUT, '|sort >foo') # pipe to sort
or die "Can't start sort: $!";
#... # print stuff to output
close OUTPUT # wait for sort to finish
or warn $! ? "Error closing sort pipe: $!"
: "Exit status $? from sort";
Please refere the above code and comment. If you use warn you will get the error in server logs as well.
"Keep pouring your ideas"
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