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The “diff” command in Linux is used to compare two files to look up their differences. However, many people confuse this command with the “cmp” command. Multiple single letter options (unless they take an argument) can be combined into a single command line word: -ac is equivalent to -a -c . The full documentation for diff is maintained as a Texinfo manual. If the info and diff programs are properly installed at your site, the command. info diff. These lines resemble ed commands to convert file1 into file2. The numbers after the letters pertain to file2. In fact, by exchanging 'a' for 'd' and readingDisplay the differences between two files, or each corresponding file in two directories. Each set of differences is called a "diff" or "patch". For files that In the simplest case, diff compares the contents of the two files from_file and to-file. A file name of - stands for text read from the standard input.