Linux system uses CMP and COMM commands to compare two files

Cmp

CMP command: Compare any two types of files, and the results output to the standard output, the default file is the same output, 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< characters > specified number of characters

-V Display version information

--HELP Display Help information

"Return value of function"

0: The file is the same

1: The files are different

>1: Error occurred

Cases:

The code is as follows:

[Root@localhost www]# cmp test1.rb test.rb #比较二个文件的不同

TEST1.RB test.rb Differ:byte 1, line 1

[Root@localhost www]# cmp-l test1.rb test.rb #显示所有不同

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 on a line-by-row basis

Compare sorted files Left_file and Right_file line by row.

-1

Masks rows (or content) different from the right file in the left file (left_file)

-2

Mask the row (or content) in the right file (Right_file) that differs from the left file

-3

Mask the same line (or content) in two files

(The original is "not the same line", the suspect is wrong)

-L

The input data is considered to be sorted according to the current locale (the-l option should be given to sort).

--help

Display Help information, and then end

--version

Display version information, and then end

Cases:

The code is as follows:

[root@localhost www]# comm test.rb test1.rb #比较二个文件