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Update cat.md
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command/cat.md

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@@ -18,7 +18,7 @@ cat(选项)(参数)
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### 选项
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2020
```
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-n或-number:从1开始对所有输出的行数编号;
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-n或--number:从1开始对所有输出的行数编号;
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-b或--number-nonblank:和-n相似,只不过对于空白行不编号;
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-s或--squeeze-blank:当遇到有连续两行以上的空白行,就代换为一行的空白行;
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-A:显示不可打印字符,行尾显示“$”;

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