巴什 - 从标到父脚本返回值 [英] Bash - Return value from subscript to parent script

问题描述

我有两个的bash脚本。父脚本调用来执行某些操作并返回一个值的下标。我怎样才能从标到父脚本返回一个值？添加在标a 收益和追赶父值没有工作。

I have two Bash scripts. The parent scripts calls the subscript to perform some actions and return a value. How can I return a value from the subscript to the parent script? Adding a return in the subscript and catching the value in the parent did not work.

推荐答案

我假定这些脚本是在两个不同的进程中运行，即你是不是源他们中的一个。

I am assuming these scripts are running in two different processes, i.e. you are not "sourcing" one of them.

这取决于你想返回什么。如果你希望只对0和255之间，然后返回一个退出code：

It depends on what you want to return. If you wish only to return an exit code between 0 and 255 then:

# Child (for example: 'child_script')
exit 42

# Parent
child_script
retn_code=$?

如果您想返回文本字符串，那么你将不得不这样做，通过标准输出（或文件）。有捕获的几种方法，最简单的是：

If you wish to return a text string, then you will have to do that through stdout (or a file). There are several ways of capturing that, the simplest is:

# Child (for example: 'child_script')
echo "some text value"

# Parent
retn_value=$(child_script)

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