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docs(expansion): fix typo
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docs/expansion.md

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@@ -271,7 +271,7 @@ $ echo {1 , 2}
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{1 , 2}
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```
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上面例子中,逗号前后有空格,Bash 就会认为这不是大括号扩展,而是两个独立的参数
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上面例子中,逗号前后有空格,Bash 就会认为这不是大括号扩展,而是三个独立的参数
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逗号前面可以没有值,表示扩展的第一项为空。
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