如何编写for循环以将数据提取到新创建的文件? [英] How to write for loop to fetch data to newly created file?

问题描述

我有一种情况，我想从上面匹配的那一行中获取以上两行

I have scenario where I want to fetch the above 2 lines from where it as matched

我有两个文件:

文件1

Ag
Ab
Ah
Av
Ax

文件2

jb:fun_0
jb:fun_jack_0
jb1:Ag

jb:fun_1
jb:fun_jack_1
jb1:Ab

jb:fun_2
jb:fun_jack_3
jb1:Ai

jb:fun_4
jb:fun_jack_4
jb1:Ah

jb:fun_5
jb:fun_jack_5
jb1:Av

jb:fun_5
jb:fun_jack_5
jb1:Al

jb:fun_5
jb:fun_jack_5
jb1:Aj

jb:fun_5
jb:fun_jack_5
jb1:Ax

我想添加for循环=>喜欢

I want to add for loop => like

首先它将使用file1 =>中的单词，就像Ag =>尝试在文件2 =>如果找到匹配项，则应将匹配的那两行以上写入新的文本文件=> demo.txt

first it will take the word from file1 => like Ag => try to find Ag in the file 2 => if match found then above 2 lines from where it as match should be written to a new text file => demo.txt

我的代码

for j in file1
do
  sr=`grep -i -B2 '$j' file2` 
  echo $sr>>demo.txt  
done

但是上面的代码不起作用=>建议我

But the above code is not working => suggest me

预期输出:在文件2 =>上面两行匹配中发现的Ag匹配应该被打印

expected output: Ag match found in file2 => above 2 lines of match should be printed

类似输出:

=======================
jb:fun_0       # 1st line
jb:fun_jack_0  # 2nd line
jb1:Ag         # => match found
=======================
jb:fun_1       # 1st line
jb:fun_jack_1  # 2nd line
jb1:Ab         # => match found
=======================

应该打印出如何匹配两行以上的输出

that how the output will on match above 2 lines should be printed

推荐答案

您可以使用以下内容:

grep -wFB2 -f file2 file1 > demo.txt

grep 选项的详细信息:

Detail of the grep options :

• -w 仅匹配完整单词:寻找 Av
时，请避免匹配 Avoid
• -B2 输出除匹配行之外的前两行
• -f file2 从file2读取模式
• -F 模式是换行分隔的纯文本，而不是正则表达式

• -w match only full words : avoid matching Avoid when looking for Av
• -B2 output the two previous lines in addition to matching lines
• -f file2 read patterns from file2
• -F the patterns are linefeed-separated plain text, not regexs

您可以在此处尝试！

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