shell脚本拼接变量

在shell脚本中，我们可以使用变量拼接字符串。有几种方法可以实现字符串的拼接。

1. 使用`${变量名}`来拼接字符串。例如，`${var1}world`会将变量`var1`和字符串`world`拼接在一起。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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