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修改（c）命令允许修改数据流中整行文本的内容。它跟插入和附加命令的工作机制一样，必须在sed命令中单独指定一行： $ sed ‘2c\ > This is a changed line of text. > ’ data6.txt This is line number 1. This is a changed line of text. This is the 3rd line. This is the 4th line. $ 在这个例子中，sed编辑器会修改第三行中的文本。也可以用文本模式来寻址： $ sed ‘/3rd line/c\ > This is a changed line of text. > ’ data6.txt This is line number 1. This is line number 2. This is a changed line of text. This is the 4th line. $ 文本模式修改命令会修改所匹配到的任意文本行： $ cat data8.txt I have 2 Infinity Stones I need 4 more Infinity Stones I have 6 Infinity Stones! I need 4 Infinity Stones I have 6 Infinity Stones… I want 1 more Infinity Stone $ $ sed ‘/have 6 Infinity Stones/c\ > Snap! This is changed line of text. > ’ data8.txt I have 2 Infinity Stones I need 4 more Infinity Stones Snap! This is changed line of text. I need 4 Infinity Stones Snap! This is changed line of text. I want 1 more Infinity Stone $ 可以在修改命令中使用地址区间，但结果未必如愿： $ cat data6.txt This is line number 1. This is line number 2. This is the 3rd line. This is the 4th line. $ $ sed ‘2,3c\ > This is a changed line of text. > ’ data6.txt This is line number 1. This is a changed line of text. This is the 4th line. $ sed编辑器会用指定的一行文本替换数据流中的两行文本，而不是逐一修改。
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Linux命令行与shell脚本编程大全