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If diff thinks that either of the two files it is comparing is binary a non-text file , it normally treats that pair of files much as if the summary output format had been selected see Brief , and reports only that the binary files are different. This is because line by line comparisons are usually not meaningful for binary files. This does not count as trouble, even though the resulting output does not capture all the differences.
If every byte in that part of the file is non-null, diff considers the file to be text; otherwise it considers the file to be binary. Sometimes you might want to force diff to consider files to be text. For example, you might be comparing text files that contain null characters; diff would erroneously decide that those are non-text files. Or you might be comparing documents that are in a format used by a word processing system that uses null characters to indicate special formatting.
You can force diff to consider all files to be text files, and compare them line by line, by using the --text -a option. If the files you compare using this option do not in fact contain text, they will probably contain few newline characters, and the diff output will consist of hunks showing differences between long lines of whatever characters the files contain.
You can also force diff to report only whether files differ but not how. Use the --brief -q option for this. In operating systems that distinguish between text and binary files, diff normally reads and writes all data as text. Use the --binary option to force diff to read and write binary data instead.
However, many personal computer operating systems represent the end of a line with a carriage return followed by a newline. On such systems, diff normally ignores these carriage returns on input and generates them at the end of each output line, but with the --binary option diff treats each carriage return as just another input character, and does not generate a carriage return at the end of each output line.
This can be useful when dealing with non-text files that are meant to be interchanged with POSIX-compliant systems. The --strip-trailing-cr causes diff to treat input lines that end in carriage return followed by newline as if they end in plain newline.
This can be useful when comparing text that is imperfectly imported from many personal computer operating systems.
This option affects how lines are read, which in turn affects how they are compared and output. If you want to compare two files byte by byte, you can use the cmp program with the --verbose -l option to show the values of each differing byte in the two files.
See Invoking cmp , for more information. If diff3 thinks that any of the files it is comparing is binary a non-text file , it normally reports an error, because such comparisons are usually not useful. As with diff , if the input files contain a few non-text bytes but otherwise are like text files, you can force diff3 to consider all files to be text files and compare them line by line by using the -a or --text option.