bash - 替换文件第 n 行中的字符串

Question

您好需要替换文件中的字符串仅在文件的第 n 行

文件1

  hi this is line 1
  hi this is line 2
  hi this is line 3
  hi this is line 4

我只需要在第 2 行替换“hi”

专家如下

  hi this is line 1
  Hello this is line 2
  hi this is line 3
  hi this is line 4

我尝试创建一个临时文件

  sed -n 2p  file1 > temp1
  perl -pi -e 's/hi/Hello/g' temp1  \\I tried to replace temp1 with line 2 in file1
  sed -i  '2d' file1   \\after this I failed to insert temp1 as a 2nd line in file1

帮我替换第 N 行文件中的一个字符串(最好没有临时文件..)。

谢谢

Answer 1

这可能对你有用:

sed -i '2s/hi/Hello/' file