When I use the diff operation in UNIX, it says that "binary files differ"?

Question

so I have myfile.c
and I used gcc -Wall myfile.c

then I used diff myfile.c teacherfile.o

in order to compare the two, but I get "Binary files myfile.c and teacherfile.o differ." what does that mean?

Answer 1

It means they are not the same type of file. One is an object file that has been compiled and is waiting to be assembled and the other is a text file. To use diff the files should be of the same type, otherwise they duff is meaningless.



Diff is meant to be used on text or source files. Not on binaries. Use them to compare source code, not compiled programs. Even if it could do this you would not be able to read the binary output. Look at the man page.



You can use



cmp -l file1.bin file2.bin | awk '{printf "%08X %02X %02X\n", $1, strtonum(0$2), strtonum(0$3)}'



if you want the binary offset.

Answer 2

Binary Files Differ

Answer 3

a.out is the executable form of myfile.c. To properly use diff, you need to compare two files of the same extension. Here's how to use the diff command: http://www.computerhope.com/unix/udiff.htm



I don't understand why you're trying to compare executables in the first place actually.

Answer 4

It means at least one of the files contains binary data -- teacherfile.o in this case.



You are comparing the source code in myfile.c with the compiled output of a different program in teacherfile.o.



If you have a file called teacherfile.c you could compare myfile.c with it to see the differences between the two source code files.

Answer 5

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