[Sh] command $? exit() & timer <= 30s failed

s=$(date +%s)

# cmd ...
result=$?

e=$(date +%s)
diff=`expr ${e} - ${s}`
if [ ${diff} -lt 30 ]; then
  exit 1
fi

exit $result

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유닉스,리눅스에서 $? 의 의미, 활용