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if then for non-zero
You can do it simpler, but I am assuming that you might have several things to do when a non-zero is found.
This is looking for the last one line of the file; knowing that the value will be on that line.
x=$(tail -1 sqlplus.out)
echo $x
if [ $x -ne 0 ]
then
echo "You have found a non-zero value"
fi
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