clear in Linux ksh

Clear in Linux
#!/usr/bin/ksh

am using clear in the script, but it is not working,
it gives an error as follows,

'xterm': unknown terminal type.

please help out.:confused:

---------- Post updated at 01:19 PM ---------- Previous update was at 12:01 PM ----------

if [ $Usage -gt $limit ]
then
clear
echo -e "\t \t \tYour usage is greater than limit
else
clear
echo -e "\t \t \tYour usage is lesser than limit
fi

what happens if you enter "clear" from the command line? Does it clear the terminal window?

yes it does!!