Command line arguments to calculate average in Shell Script

This shell script shows how to accept command line arguments in shell scripts. In this example it accepts two numbers and calculates their average.

avg=0
temp_total=0
number_of_args=$#

#
# First see the sufficent cmd args
#
if [ $# -lt 2 ] ; then
   echo -e "Opps! I need atleast 2 command line args\n"
   echo -e "Syntax: $0: number1 number2 ... numberN\n"
   echo -e "Example:$0 5 4\n\t$0 56 66 34" 
   exit 1
fi

#
# now calculate the average of numbers given on command line as cmd args
#
  
for i in $*
do

   #  addition of all the numbers on cmd args
   temp_total=`expr $temp_total + $i`

done

avg=`expr $temp_total / $number_of_args`
echo "Average of all number is $avg"