array + = value在ksh中不起作用? [英] array+=value not work in ksh?

问题描述

我在某处读到ksh的数组支持+=来添加新元素，但是我尝试了一下，但它不起作用:

I read somewhere that ksh's array supports += to append new elements, but I tried it and it doesn't work:

[ksh] # arr=(a b c d)
[ksh] # arr+=e
[ksh] # echo ${arr[*]}
ae b c d
[ksh] #

为什么arr[0]变为ae?

推荐答案

要将元素添加到数组，应该像这样:

To add an element to the array, it should be like this:

arr+=(e)

通过执行arr+=e，它将添加到数组的第一个元素中.这是因为仅名称arr指向数组本身的第一个元素:

By doing arr+=e , it will add to the 1st element of the array. Its because just the name arr points to the 1st element of the array itself:

$ arr=(a b c d)
$ echo ${arr[0]}
a
$ echo $arr
a

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