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doc: Update sed.md (#589)
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command/sed.md

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@@ -172,9 +172,10 @@ sed '2,$d' file
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sed '$d' file
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```
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删除文件中所有开头是test的行:
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删除文件中所有开头是test的行(d写外边效果一样)
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```shell
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sed '/^test/d' file
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sed '/^test/'d file
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```
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