I got it with the below,Its working
redirecting it to a file and renaming the output file with the same file for next days run
#!/bin/ksh
cd /home/gaddamja
paste Prod_Huffs_Utilisation.xls Temp2 >/home/gaddamja/Prod_Huffs_Utilisation1.xls
echo "Hi All,\n">>/home/gaddamja/Temp
echo "PFA Prod huffs usage as of now( `date`):">>/home/gaddamja/Temp
echo "\n\n\nRegards,">>/home/gaddamja/Temp
echo "Jagadish.">>/home/gaddamja/Temp
/usr/bin/uuencode Prod_Huffs_Utilisation1.xls Prod_Huffs_Utilisation.xls >>/home/gaddamja/Temp
cat /home/gaddamja/Temp | /usr/ucb/mail -s "Huffs Report"
jagdish-chandra-bose.gaddam@ubs.com
mv Prod_Huffs_Utilisation1.xls Prod_Huffs_Utilisation.xls
rm Temp
But again my doubt is why not
paste Prod_Huffs_Utilisation.xls Temp2 >/home/gaddamja/Prod_Huffs_Utilisation.xls is working..
cant we redirect the output to same file in unix ?
thanks n advance