间接引用bash中的数组值

本文介绍了间接引用bash中的数组值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我试图间接引用bash中数组中的值.

I am trying to do an indirect reference to values in an array in bash.

anotherArray=("foo" "faa") foo=("bar" "baz") faa=("test1" "test2") for indirect in ${anotherArray[@]} do echo ${!indirect[0]} echo ${!indirect[1]} done

这不起作用.我通过回显$ indirect尝试了很多不同的事情来获得$ foo的不同值，但是我只能得到第一个值，所有值，"0"或什么都没有.

This does not work. I tried a lot of differenct things to get the different values of $foo by echoing $indirect but I can only get the first value, all values, '0' or nothing at all.

推荐答案

bash的现代版本采用了ksh功能"namevars"，非常适合此问题:

Modern versions of bash adopt a ksh feature, "namevars", that's a perfect fit for this issue:

#!/usr/bin/env bash case $BASH_VERSION in ''|[123].*|4.[012]) echo "ERROR: Bash 4.3+ needed" >&2; exit 1;; esac anotherArray=("foo" "faa") foo=("bar" "baz") faa=("test1" "test2") for indirectName in "${anotherArray[@]}"; do declare -n indirect="$indirectName" echo "${indirect[0]}" echo "${indirect[1]}" done