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Showing content from https://www.geeksforgeeks.org/linux-unix/diff3-command-in-linux-with-examples/ below:

diff3 command in Linux with examples

Last Updated : 11 Jul, 2025

command is used to compare the three files line by line. It internally uses the

command to compare. When three files are compared then the following output may come which have their own meaning:

• ==== : It means all the files are different.
• ====1 : File 1 is different.
• ====2 : File 2 is different.
• ====3 : File 3 is different.

diff3 [OPTIONS]

Let us consider three files as

,

and

.

Now if diff3 command is used over these three files then following output will come:

Here, the very first line ‘

’ tells that the file number 3 i.e. c.txt is different from the other two. This is visible in the output too.

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