What are the differences between using cmp and comm commands in Linux systems
This article mainly introduces "what are the differences between using cmp and comm commands in Linux systems". In daily operation, I believe that many people have doubts about the differences between cmp and comm commands in Linux systems. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the questions of "what are the differences between cmp and comm commands in Linux systems?" Next, please follow the editor to study!
Cmp
Cmp command: compare any two types of files, and output the results to standard output. The same default file is not output, but different file output differences.
Necessary parameters
-c displays different information
-l list all the different information
-s error message does not prompt
Select parameters
-I specify the number of characters
-v displays version information
-- help displays help information
[return value of function]
0: the file is the same
1: the files are different.
> 1: an error occurred
Example:
The code is as follows:
[root@localhost www] # cmp test1.rb test.rb # compare the differences between the two files
Test1.rb test.rb differ: byte 1, line 1
[root@localhost www] # cmp-l test1.rb test.rb # shows all the differences
1 160 162
2 165 145
3 164 161
4 163 165
5 40 151
6 42 162
7 150 145
8 145 40
9 153 42
10 153 155
11 153 171
12 42 163
13 12 161
Cmp: EOF on test1.rb
Comm
Comm-compare two sorted files line by line
Compare the sorted files LEFT_FILE and RIGHT_FILE line by line.
-1
Mask lines (or contents) in the file on the left (LEFT_FILE) that are different from the file on the right
-2
Mask lines (or contents) in the right file (RIGHT_FILE) that are different from the left file
-3
Mask the same line (or content) in both files
(translation note: the original text is "different lines", suspected to be incorrect)
-l
It is considered that the input data is sorted according to the current locale (the-l option should be provided for sort).
-- help
Display help information and then end
-- version
Display version information, and then end
Example:
The code is as follows:
[root@localhost www] # comm test.rb test1.rb # compare two files
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