Linux basic command-comm

Comm

Compare two sorted files line by line. The results are displayed in three columns: column 1 shows content that appears only in file1, column 2 shows content that appears only in file2, and column 3 shows content that appears at the same time. The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

1. Grammar

Comm [OPTION]... FILE1 FILE2

2. List of options

Option

Description

-- version

Display command version information

-- help

Show help documentation

-1

Do not display what appears in the first file

-2

Do not display the contents of the second file

-3

Do not display simultaneous content

-- check-order

Check that the input is sorted correctly, even if all input lines have been paired

-- nocheck-order

Do not check whether the input is sorted correctly

-- output-delimiter=STR

Use STR to split columns

3. Examples

1) Direct comparison

[root@localhost weijie] # diff-y 1.c 2.c / / View two files

Abc | abd

Def | efg

Ghi | ghi

[root@localhost weijie] # comm 1.c 2.c / / comparison, these two files must have been sorted

Abc

Abd

Def

Efg

Ghi

2) display only the contents common to the two files

[root@localhost weijie] # comm-12 1.c 2.c

Ghi

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