加入SED连续两行 [英] Add two consecutive lines in sed

问题描述

我想第一个字符串搜索后添加两行。我使用的：

I would like to add two lines after the first string search. I am using:

$ cat file1
HAI
BYE
HAI
ONE
TWO

$ VAR=`cat -n file1 |grep -w HAI |head -1 |awk '{print $1}'`
$ sed "$VAR a\
LINE ONE \
LINE TWO
" file1

这是给下面的输出。

It is giving the following output.

HAI
LINE ONE LINE TWO
BYE
HAI
ONE
TWO

但我想输出是：

HAI
LINE ONE 
LINE TWO
BYE
HAI
ONE
TWO

我怎样才能做到这一点？我试图保持\\ n，而是它给错误。

How can I achieve this? I tried to keep the \n but it is giving errors.

推荐答案

这个替换您的sed命令：

Replace your sed command with this:

sed $VAR' a\
LINE ONE\
LINE TWO
' file1

BTW你刚才的grep，awk中也可以减少到这一点：

btw your earlier grep, awk can also be reduced to this:

VAR=$(awk '$1 == "HAI" && NR==1{print NR}' file1)

高得多是得到这样的单awk命令完整的答案：

Much Better is to get full answer in single awk command like this:

awk '{if ($1=="HAI" && done!=1) {done=1; printf("%s\nLINE ONE\nLINE TWO\n", $0);} \
      else print $0}' file1

OUTPUT：

HAI
LINE ONE
LINE TWO
BYE
HAI
ONE
TWO

这篇关于加入SED连续两行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！