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Off topic:
Be aware that there is a useful system script which comes with Oracle called oraenv . Well worth a read of the script.

That's the way it's supposed to work.

Running it like ./programname runs it in its own, independent, separate shell. That shell, not yours, has the environment variables set in it. And when the...

awk '!/^#|^$/{print $3}' applcust.txt | while read i ; do grep $i patch999999.log >/dev/null 2>&1 || echo "$i not found in log" ; done