- Create first file
1
2
3
4
5
6
7
$ vi file1
1
2
3
4
5
- Create second file
1
2
3
4
5
6
$ vi file2
2
3
34
35
- Use comm to find common lines
1
2
3
$ comm -12 file1 file2
2
3
Please make sure that data is sorted in asending order else please use sort command.
1
2
3
4
5
6
7
8
9
10
11
12
13
$ vi file3
23
4
1
2
$ cat file3 | sort -n -o file3
$ cat file3
1
2
4
23