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Update echo.md (jaywcjlove#381)
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command/echo.md

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@@ -16,7 +16,9 @@ echo(选项)(参数)
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### 选项
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```shell
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-e:激活转义字符。
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-e:启用转义字符。
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-E: 不启用转义字符(默认)
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-n: 结尾不换行
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```
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使用`-e`选项时,若字符串中出现以下字符,则特别加以处理,而不会将它当成一般文字输出:

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