导出环境变量bash

这是我编写用来测试的脚本,假设这个脚本是由其他程序运行的,并且可以访问env变量。

echo $STATE
if [[ $STATE == "public" ]]; then
    echo foo
    export STATE='private'
elif [[ $STATE == "private" ]]; then
    echo bar
    export STATE='public'
fi
echo $STATE

我想要的结果是

$ ./test.sh
public
foo
private
$ ./test.sh
private
bar
public

但实际产出是

$ ./test.sh
public
foo
private
$ ./test.sh
public
foo
private

看来 export