Shell编程进阶 2.1 shell函数

vim fun.sh

#!/bin/bash
function mysum() {
sum=$[$1+$2]
echo $sum
}

a=3
b=3
mysum $a $b

sh fun.sh

#!/bin/bash
function mysum() {
sum=$[$1+$2]
echo $sum
}

a=3
b=3
mysum $a $b
echo $sum

sh fun.sh

#!/bin/bash
function mysum() {
local sum=$[$1+$2]
echo $sum
}

a=3
b=3
mysum $a $b
echo $sum