$ BASH_SOURCE的怪异行为 [英] Weird behaviour of $BASH_SOURCE

问题描述

如果您有声明全局函数的foo.sh:

If you have foo.sh that declares a global function:

myfunction(){ echo $*;}
declare -fx myfunction

您就可以找到它:

. foo.sh

然后从bar.sh调用全局函数:

And then you call the global function from bar.sh:

myfunction $BASH_SOURCE
myfunction a b c
myfunction $BASH_SOURCE

第三个调用将产生一个空行，除非已获取bar.sh.有什么想法可以绕过这个问题吗?

The third call produces a blank line, unless bar.sh is being sourced. Any ideas how to bypass this problem?

推荐答案

根据bash手册， BASH_SOURCE 是一个数组，其每个元素都是与的相应元素相关联的文件名> FUNCNAME ，仅在执行Shell函数时存在".

According to the bash manual, BASH_SOURCE is an array, each element of which is the filename associated with the corresponding element of FUNCNAME, which "exists only when a shell function is executing".

因此，在函数调用之外的 BASH_SOURCE 中的任何值(且函数自变量的求值均在函数调用之外)都是未记录的用法；该变量当时没有记录的值.

So any value in BASH_SOURCE outside of a function call (and the evaluation of function arguments are outside of a function call) is an undocumented use; the variable has no documented value at that point.

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