Shell脚本(五)函数

#!/bin/bash

function add_v1() {
echo "call function add"
}

function add_v2() {
echo "number of params: $#"
echo "first param: $1"
echo "second param: $2"

local sum=0
for item in $@
do
sum=$(($sum + $item))
done
echo "result is $sum"
}

function add_v3() {
local sum=0
for item in $@
do
sum=$(($sum + $item))
done

return $sum
}

# another way to return value
function add_v4() {
local sum=0
for item in $@
do
sum=$(($sum + $item))
done

echo $sum
}

global_variable=0

function add_v5() {
local sum=0
for item in $@
do
sum=$(($sum + $item))
done

global_variable=$sum
}

add_v1

add_v2 10 20 30

add_v3 10 20 30
# get return value from $?
# in this case, the max return value is 255, 256 will be 0
echo "return value of add_v3: $?"

# get return value directly
# in this case , no limit on return value
result_v4=`add_v4 200 50 5`
echo "return value of add_v4: $result_v4"

add_v5 100 200 300
echo "global_variable: $global_variable"