linux - 替换文件中的行

Question

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Answer 1

最简单的方法是使用 sed 进行替换:

$ sed 's/^aaa = (aa,bb,cc)$/aaa = (dd,ee,ff)/' file
sadasd_dsada = (aa,bb,cc)
aaa = (dd,ee,ff)
sadasd_dsada = (aa,bb,cc)

字符 ^ 和 $ 分别匹配正则表达式中行的开头和结尾，这意味着替换只会发生在整行匹配中。

一旦您对更改感到满意，请使用 -i 选项保存回文件。

$  sed -i 's/^aaa = (aa,bb,cc)$/aaa = (dd,ee,ff)/' file

编辑:

$ cat file
sadasd_dsada = (aa,bb,cc)
aaa = (aa,bb,cc)
aaa = foo
sadasd_dsada = (aa,bb,cc)
aaa = bar

$ sed 's/^aaa = .*/aaa = (dd,ee,ff)/' file
sadasd_dsada = (aa,bb,cc)
aaa = (dd,ee,ff)
aaa = (dd,ee,ff)
sadasd_dsada = (aa,bb,cc)
aaa = (dd,ee,ff)