bash中数组的动态变量名称 [英] Dynamic variable names for an array in bash

问题描述

我有一个名为循环"的数组.

I have an array called "loop".

对于循环"中的每个元素，我想创建一个数组，其名称包含当前元素的文本.

For each element in "loop" I want to create an array whose name contains the text of the current element.

然后我想遍历每个新数组并打印每个数组中的每个元素.

I then want to loop through each new array and print every element from each array.

这篇文章似乎对变量有很好的解决方案，但我不知道如何使其适用于数组.

This post seems to have a good solution for variables but I do not know how to adapt it to work for arrays.

我的脚本

#!/bin/bash
loop=(
first
second
third
)

for word in "${loop[@]}"    
do
        declare "${word}_holder=( hello world )"
        var="${word}_holder"
        echo "$var"
        for i in "${!var}[@]"
        do
                echo "$i"
        done
done

---

当前输出

first_holder
( hello world )[@]
second_holder
( hello world )[@]
third_holder
( hello world )[@]

所需的输出

first_holder
hello
world
second_holder
hello
world
third_holder
hello
world

推荐答案

虽然不漂亮，但这只是一个开始:

It ain't pretty, but it's a start:

#!/bin/bash
loop=(
first
second
third
)

for word in "${loop[@]}"    
do
    var=${word}_holder
    eval "declare -a ${var}"
    eval "${var}=( Hello World )"
    eval 'nEntries=${#'${var}'[@]}'
    echo ${var}
    for (( ii=0; ii<$nEntries; ii++ )); do
       cmd='echo ${'${var}'['$ii']}'
       eval ${cmd}
    done
done

这篇关于bash中数组的动态变量名称的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！