如何在一个文件结束后停止diff？

Question

我比较了两个文件的长度不同，但我不想在更短的文件结束后看到较长文件的输出。 虽然我确实需要知道在较短文件结束之前是否有任何文件中有缺少的行。

我不必使用差异，我可能会使用python来做到这一点，有没有一种简单的方法来做同样的python？

Answer 1

看是否有此解决方案适用于您：

dhruvpathak@dhruvpathak:~$ cat shortfile 
this is a 
short file 
created 
for example 
dhruvpathak@dhruvpathak:~$ cat longfile 
this is a 
long file 
created 
for example. 
but also contains 
some extra text 
which needs to be 
ignored when 
the small file 
ends. 

dhruvpathak@dhruvpathak:~$ cat shortfile > /tmp/a && echo "*****ENDMARKER*****" >> /tmp/a && cat longfile > /tmp/b && diff /tmp/a /tmp/b | grep -B 100000 "*****ENDMARKER*****" 
2c2 
< short file 
--- 
> long file 
4,5c4,10 
< for example 
< *****ENDMARKER*****