thanks buddy.

if [ -s "/clocal/mqbrkrs/user/mqsiadm/sanjay/temp" ]
Can you tell me the reason, why should not we put $ before the name of file, in such statements. ?

In the cat command that i have used, its working in the same manner as you said. Why the $ is creating problem, even here i want contenty of temp file should be given to the pipe.
cat "/clocal/mqbrkrs/user/mqsiadm/sanjay/temp" | mailx -s "$Subject" $MAIL_RECIPIENTS