如何在Bash中鏈接字符串變量 - How to concatenate string variables in Bash

問題：

In PHP, strings are concatenated together as follows: 在PHP中，字符串按如下方式串聯在一塊兒：

$foo = "Hello";
$foo .= " World";

Here, $foo becomes "Hello World". 在這裏， $foo變成「 Hello World」。

How is this accomplished in Bash? 如何在Bash中完成？

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解決方案：

參考一： https://stackoom.com/question/HXqp/如何在Bash中鏈接字符串變量
參考二： https://oldbug.net/q/HXqp/How-to-concatenate-string-variables-in-Bash