Bash function

function.sh

# A simple function which takes
# no parameters and returns nothing
function fun1() {
  echo "A simple function"
}

# A function which takes parameters
# and return nothing
function fun2() {
  echo "Fun:: Number of parameters:   ${#@}"
  echo "Fun:: List of all parameters: $@"
  echo "Fun:: Parmeter # 1: $1"
  echo "Fun:: Parmeter # 2: $2"
}


# A function which takes parameters
# and return a value using return
function fun3() {
  local var1=$1
  local var2=$2
  local var3=$((var1 + var2))
  return $var3
}

# A function which takes parameters
# and return a value using echo
function fun4() {
  local var1=$1
  local var2=$2
  local var3=$((var1 + var2))
  echo $var3
}

#
# Testing of functions
#
fun1
fun2 10 20
fun3 10 20
echo "fun3 result = $?"

ret=$(fun4 10 20)
echo "fun3 result = $ret"