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This article mainly introduces "the usage of Linux diff command". In daily operation, I believe many people have doubts about the usage of Linux diff command. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "the usage of Linux diff command"! Next, please follow the editor to study!

Linux diff command

Let's understand the diff command through some practical examples.

Suppose we have two files (file1 and file2):

$cat file1 Hi, Hello, How are you? I am fine, Thank you. $cat file2 Hello, Hi, How are you? I am fine.

You can see that there is a slight difference between the two files. Now, let's see how the diff command can find out the difference between the two.

Run the diff command like this:

$diff file1 file2 1d0

Hi, 4,5c4

I am fine.

You can see that diff is followed by the names of two files as command line arguments, and it generates a difference comparison in the output. The output is not easy to understand. The reason is that it is used by computers, not for humans. However, let's decode the output step by step:

Note-in the following text, file1 and file2 will be treated as old and new files.

1d0

I am fine.

Here, the line 4jre 5c4 means that the 4 to 5 lines in the old file have now been changed and need to be replaced by the fourth line in the new file. Add and delete rows with'> 'and' respectively

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