bash外壳嵌套循环 [英] bash shell nested for loop

问题描述

我想编写一个嵌套的for循环，该循环必须在bash shell提示符下工作.嵌套在单行命令中的for循环中.

I want to write a nested for loop that has to work in the bash shell prompt. nested for loop in Single line command.

例如

for i in a b; do echo $i; done
a
b

在上面的示例中，for循环在单行命令右执行. 像这样，我在shell提示中尝试了嵌套的for循环.它不起作用. 这该怎么做.请对此进行更新.

In the above example, for loop is executed in a single line command right. Like this I have tried the nested for loop in the shell prompt. Its not working. How to do this. Please update me on this.

推荐答案

这不是一个嵌套循环，而仅仅是一个循环.嵌套版本也适用:

This is not a nested loop, just a single loop. And the nested version works, too:

# for i in a b; do for j in a b; do echo $j; done; done
a
b
a
b

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