How do I Compare two files under Linux or UNIX?

To compare two files under Linux or UNIX, you can use the "diff" command. "diff" is a utility that compares two files and displays the differences between them.

Here are the steps to compare two files using "diff":

1. Open a terminal and navigate to the directory where the two files that you want to compare are located.

2. Type the following command to compare the two files:

diff FILE1 FILE2

Replace "FILE1" with the name of the first file and "FILE2" with the name of the second file.

3. "diff" will compare the two files and print the differences between them to the terminal. If the files are identical, "diff" will not return any output.

Here is an example of the output of the "diff" command:

4c4
< This is line 4 of the first file.
---
> This is line 4 of the second file.

This output indicates that the fourth line of the first file is different from the fourth line of the second file. The "diff" command can also display other types of differences, such as added or deleted lines.

With the "diff" command, you should be able to compare two files under Linux or UNIX and see the differences between them.

Note: "diff" has many options and features that allow you to customize the way it compares files. Consult the "diff" documentation for more information on the available options and usage examples.