请问sed如何对匹配到的文本编号？

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请问sed如何对匹配到的文本编号？

by mjxian-2 :: Rate this Message:

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用sed对整个文件进行全局的匹配，第一个匹配到的编号为1，……
sed是否有内建的变量一类可以简洁的完成它？

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