使用UNIX如何将3个文件合并为一个文件，即（头文件，详细文件和预告文件）

Question

I have 3 files (Header file, Detailed file, and Trailer file). For example..

Header file contains data like below H.txt

H Chris 3434

Detail file contains data like below D.txt

D History 2 02/20/2018   
D Maths   2 02/20/2018  
D Science 2 02/20/2018  
D Biology 2 02/20/2018  

Trailer record like below T.txt

T 02/20/2019

I want a final file with below data..

H Chris 3434  
D History 2 02/20/2018  
D Maths   2 02/20/2018  
D Science 2 02/20/2018  
D Biology 2 02/20/2018  
T 4 02/20/2019  

Answer 1

cat file1 file2 file3 > result_file

要么

for f in file1 file2 file3 ; do while read line; do echo -e "$line" >> result_file ; done < $f; done