从特定行开始在文件中插入行 [英] Insert lines in a file starting from a specific line

问题描述

我想在 bash 中从特定行开始将行插入到文件中.

I would like to insert lines into a file in bash starting from a specific line.

每一行都是一个字符串，它是数组的一个元素

Each line is a string which is an element of an array

line[0]="foo"
line[1]="bar"
...

具体的行是'fields'

and the specific line is 'fields'

file="$(cat $myfile)"
for p in $file; do
    if [ "$p" = 'fields' ]
        then insertlines()     #<- here
    fi
done

推荐答案

这可以用 sed 来完成: sed 's/fields/fields New Inserted Line/'

This can be done with sed: sed 's/fields/fields New Inserted Line/'

$ cat file.txt 
line 1
line 2 
fields
line 3
another line 
fields
dkhs

$ sed 's/fields/fields
New Inserted Line/' file.txt 
line 1
line 2 
fields
New Inserted Line
line 3
another line 
fields
New Inserted Line
dkhs

使用 -i 就地保存而不是打印到 stdout

Use -i to save in-place instead of printing to stdout

sed -i 's/fields/fields 新插入的行/'

sed -i 's/fields/fields New Inserted Line/'

作为 bash 脚本:

As a bash script:

#!/bin/bash

match='fields'
insert='New Inserted Line'
file='file.txt'

sed -i "s/$match/$match
$insert/" $file

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