在bash中逐行并行显示两个文件内容[重复]

Question

此问题已经在这里有了答案：

merge contents of two files into one file in bash（5个答案）

关闭4分钟前。

例如，我有两个文本文件：

file1.txt

line 1 file 1
line 2 file 1
...

file2.txt

line 1 file 2
line 2 file 2
...

我确定file1.txt和file2.txt的行数相同。

我想要的是如何使用以下格式导出到file3.txt：

line 1 file 1
line 1 file 2

line 2 file 1
line 2 file 2

...

我只想逐行查看这些内容。命令diff file1.txt file2.txt对我没有帮助，

Answer 1

awk 'FNR==NR{a[FNR]=$0;next} {print a[FNR] ORS $0}' Input_file1 Input_file2

输出将如下。

line 1 file 1
line 1 file 2
line 2 file 1
line 2 file 2

说明：添加以上代码的详细说明。
awk '                       ##Starting awk program from here.
FNR==NR{                    ##Checking condition if FNR==NR which will be TRUE when 1st Input_file named file1 is being read here.
  a[FNR]=$0                 ##Creating an array named a whose index is FNR and value is current line value.
  next                      ##next will skip all further statements from here.
}                           ##Closing BLOCK for FNR==NR condition here.
{                           ##Block from here will be executed when Input_file2 will be started being read.
  print a[FNR] ORS $0       ##Printing array a value with current FNR status ORS(new line) and current line value here.
}                           ##Closing BLOCK for above opened one here.
' file1 file2               ##Mentioning Input_file names here.