How to determine whether file contents are the same in Linux

In Linux, you can use the md5sum command to determine whether the file contents are the same. This command can generate and verify the md5 value of the file; md5sum checks the file content, not the file name. If the contents of different files are different, If the md5 value is the same, the file content is the same, and the syntax is "md5sum file name".

#The operating environment of this article: linux7.3 system, Dell G3 computer.

How does Linux determine whether the file contents are the same?

The MD5 algorithm can be used to verify the integrity of network file transmission. Linux's md5sum command is used to generate and verify the md5 value of a file. It should be noted that md5sum checks the file content, not the file name.​​ ​

Syntax:

md5sum [选项]... [文件]...

The md5sum command uses the MD5 message digest algorithm (128 bits) to calculate and check the checksum of the file. Generally speaking, after installing Linux, there will be the tool md5sum, which can be run directly in the command line terminal.

The md5sum command is used to generate and verify the md5 value of a file. It verifies the contents of the file bit by bit. It is the content of the file, regardless of the file name, that is, the file content is the same and its md5 refers to the same.

Special instructions:

1) md5sum is to verify the file content, and has nothing to do with whether the file names are the same

2) The md5sum value is verified bit by bit, so the larger the file, The longer the verification time is.

Summary: Use md5sum to verify the generated file verification code to discover inconsistencies in file content caused by abnormal file transmission (network transmission, copying, and transmission between different local devices).

The example is as follows:

It can be seen from the above that the contents of the two files test1 and test2 are consistent.

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