# Implement a bash shell script that prints the result of the sum of a set
# of numbers passed to the script as a command line argument.
# A number of equivalent solutions have been proposed. The differences between
# them consists on the way used to iterate between program arguments.
#    Example:
# $ ./bash_ex3.sh 2 3 4 5 6
# 1) Arguments: 2 3 4 5 6  Sum: 20
# 2) Arguments: 2 3 4 5 6  Sum: 20
# 3) Arguments: 2 3 4 5 6  Sum: 20


#!/bin/bash


# First solution
final_sum=0

echo -n "1) Arguments: "
# The variable $* contains all the program arguments with the exclusion of 
# the program name
for a in $*
do
   echo -n "$a "
   final_sum=$[$final_sum+$a]      
done  
echo " Sum: $final_sum"


# Second solution
final_sum=0

echo -n "2) Arguments: "
# echo writes content of the variable $* to the screen
# The symbols ` ` represents the output of the command
for a in `echo $*`
do
   echo -n "$a "
   final_sum=$[$final_sum+$a]      
done  
echo " Sum: $final_sum"


# Third solution
final_sum=0

echo -n "3) Arguments: "
# The code $(command) corresponds to `command`
for a in $(echo $*)   
do
   echo -n "$a "
   final_sum=$[$final_sum+$a]      
done  
echo " Sum: $final_sum"