bash忘记了导出变量 [英] bash forgets export variable

问题描述

在脚本中，我什至无法进行最简单的变量导出，就无法在bash中工作-我在做什么错了?

I am unable to make even the simplest export of variables, from within scripts, to work in my bash - what am I dooing wrong?

文件 test.sh :

#!/bin/bash
echo $ttt
ttt="fffalse"
export ttt
echo $ttt

bash测试:

hpek@hpek:~/temp$ export ttt="tttrue"
hpek@hpek:~/temp$ ./test.sh 
tttrue
fffalse
hpek@hpek:~/temp$ ./test.sh 
tttrue
fffalse
hpek@hpek:~/temp$ 

我现在从答案中知道这是行不通的.-但是如何使进程之间的单个变量被记住?我需要将其存储在文件中吗?

I now know from the answers, that this will not work. -but how can make a single variable remembered between processes? Do I need to store it in a file?

推荐答案

./test.sh 与 bash test.sh

每个运行的shell脚本实际上是一个子进程(子进程).
而且子进程无法将env-var导出到其父级.

Each shell script running is, in effect, a subprocess (child process) of the parent shell.
And subprocess cannot export env-var to it's parent.

您可以尝试此操作(在相同的环境中运行):

You can try this（run in the same environment）:

. test.sh

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