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Linux comm Command

Linux Command Manual

The Linux comm command is used to compare two sorted files.

This command compares two sorted files line by line and displays the results. If no parameters are specified, the results are divided into three columns: the first column shows lines unique to the first file, the second column shows lines unique to the second file, and the third column shows lines common to both files. If the filename is -, the comm command will read data from the standard input device.

Syntax

comm [-123][--help][--version][file1][file2]

Parameters:

Example

The contents of aaa.txt and bbb.txt are as follows:

[root@localhost text]# cat aaa.txt 
aaa 
bbb 
ccc 
ddd 
eee 
111 
222
[root@localhost text]# cat bbb.txt
bbb 
ccc 
aaa 
hhh 
ttt 
jjj

Executing the comm command produces the following output:

[root@localhost text]# comm aaa.txt bbb.txt 
aaa
                bbb
                ccc
        aaa
ddd
eee
111
222
        hhh
        ttt
        jjj
Column 1  Column 2  Column 3

The first column contains lines unique to aaa.txt, the second column contains lines unique to bbb.txt, and the third column contains lines common to both aaa.txt and bbb.txt. The columns are delimited by tab characters \t.

Linux Command Manual

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