Thanks for your reply.

I just tried with the script which you give me and it did work with some changes. I modified the script like below

find -name core.* -size +10485760c > ./big.txt
#if [[ -s ./big.txt ]] ; then
#big.txt > /usr/bin/mailx -s 'file too big ' abc@xyz.com

this works but I want to see file size too like this..
-rw------- 1 root root 254517248 Aug 4 21:36 core.2909 and this line i wanna send as a mail.

when I tried with this...

/bin/find /path/tofile -name filename.whatever -size +10485760c > ./big.dat It says couldn't find the /bin/find.

Thanks for your help.