Use the comm command line tool in Linux

Linux comm command line tool-general Linux technology-Linux technology and application information, the following is a detailed description. If you want to compare the content of the two text files in Linux Command Line Mode, find the content that is simultaneously included in the two text files, you can use the Linux System Tool comm for processing. The premise is that the two compared text files are ordered. You can use sort for processing. The specific operation method is as follows:

The original file is as follows:
A.txt
D
C
B
A
B .txt
G
F
B
A
Sorting
Sort a.txt> a1.txt
Sort B .txt> b1.txt
The processing result file is as follows:
A1.txt
A
B
C
D

B1.txt
A
B
F
G
Comparison
Comm a1.txt b1.txt
A
B
F
G
C
D
The output result contains three columns, of which 3rd columns show the content contained in both files.
The 1th column is only included in the first a.txt file.
The 2th column is only included in the B .txt file.

You can use parameters to specify the columns to be displayed, for example:
Comm a1.txt b1.txt-12
A
B
-12 indicates that no 1st or 2nd columns are displayed, and only 3rd columns are displayed.

-1: column 1st is not displayed. Column 2 and 3 are displayed.

-Column 3 and Column 2nd are not displayed in column 13.