用其他文本文件中的行替换文本文件中的行 [英] Replace line in text file with line from other text file

问题描述

我的问题是以下问题的变体:

My question is a variant of the following one:

bash:替换文本文件中的整行

问题在于用给定的字符串替换文件的第N行(替换行).就我而言，我不能只输入替换行，而是必须从另一个文件中读取它.

The problem there was to replace the Nth line of a file with a given string (a replacement line). In my case, I can't just type the replacement line, but I have to read it from another file.

例如:

textfile1:

textfile1:

my line
your line
his line
her line

textfile2:

textfile2:

our line

我想用textfile2中的行替换textfile1的第二行.

I want to replace the 2nd line of textfile1 with the line from textfile2.

我以为我可以阅读textfile2

I thought I could just read the textfile2

while IFS= read SingleLine 

等然后使用 $ SingleLine 作为替换行，但是我失败了...根据我使用的引号类型(请原谅我的无知...)，我最终将问题所在的行替换为文本 $ SingleLine 或使用 SingleLine 或仅收到错误消息:-[

etc. and then use $SingleLine as the replacement line, but I failed... Depending on the type of quotes I used (please excuse my ignorance...) I ended up replacing the line in question with the text $SingleLine or with SingleLine or just getting an error message :-[

我确定您可以帮助我！

编辑解决方案:我花了点小钱就去寻找内联解决方案

EDIT about the solution: I went for the inline solution with the small change

sed '2d;1r textfile2' textfile1 > newfile1 

要替换第N行，解决方法是(有关说明，请参阅有关接受的解决方案的评论)

To replace the Nth line, the solution would be (see comments on accepted solution for explanations)

sed 'Nd;Mr textfile2' textfile1 > newfile1 

用N表示所需的行号，M = N-1.

with N the desired line number and M=N-1.

谢谢大家！

推荐答案

使用 sed :

sed '2d;1r file2' file1
my line
our line
his line
her line

要进行内联

sed -i.bak '2d;1r file2' file1

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