some sytem scripts

shell_scripts/lessons/average_number.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+
+avg=0
+temp_total=0
+number_of_args=$#
+
+#
+# First see the sufficient 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"