compare two files with numbers and find the difference , using linux shell command

Question

8       13
10      22
13      24
22      26
24      27
26      28
27      29
28      32
29      34
32      35
34      40
66
78

I have two files like the above,file1 is the first column while file 2 is the second and I want to get the difference between these two files like 8 is in the first file but not in the second file i used comm but the results are strange how to achieve what I want?

Answer 1

man diff

请仔细阅读，我相信它会做您想要的。