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@ -55,4 +55,38 @@ ls a[^b].txt
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```bash
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ls a{a,b,c,d,ee}.txt
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```
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可以看到是匹配所有的模式, 而不是其中任意一个
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使用ls会提示无法找到该文件
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而使用echo会直接输出这些模式的匹配结果
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```bash
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# 大括号可以进行嵌套
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echo {j{p,pe}g,png}
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# jpg jpeg png
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```
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{...}与[...]有一个很重要的区别。如果匹配的文件不存在,[...]会失去模式的功能,变成一个单纯的字符串,而{...}依然可以展开。
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```bash
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# 不存在 a.txt 和 b.txt
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ls [ab].txt
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# ls: [ab].txt: No such file or directory
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ls {a,b}.txt
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# ls: a.txt: No such file or directory
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# ls: b.txt: No such file or directory
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```
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### {start..end} 模式
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匹配连续范围的所有情况 ( 注意中间是两个点 )
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比如
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```bash
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# 匹配a.txt b.txt c.txt
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ls {a..c}.txt
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# 对于整数有特殊处理
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echo {10..20}
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# 输出从10到20的所有整数
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```
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