参数扩展可以嵌套在Bash中吗? [英] Can parameter expansion be nested in Bash?

问题描述

可能重复:
可以将$ {var}参数扩展表达式嵌套在bash中吗?

Possible Duplicate:
Can ${var} parameter expansion expressions be nested in bash?

是否可以嵌套shell参数扩展(${})?

Is it possible to nest the shell parameter expansion (${})?

如果我想做这样的事情:

If I want to do something like this:

foo=( 1 2 3 4 5 )
echo ${${foo[@]/3/bar}:1}

推荐答案

据我所知，无法嵌套shell参数扩展.恐怕您将不得不找出实现所需需求的另一种方法.如果您发布代码，也许我们可以为您提供帮助.

As far as I know, it is not possible to nest shell parameter expansion. I'm afraid you'll have to figure out another way of achieving what you need. If you post the code, maybe we can help you.

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