Can diff compare binary files?

No, the diff command is not suitable for comparing binary files. It is designed primarily for text files and compares them line by line. When you attempt to use diff on binary files, it will typically output a message indicating that the files are binary and will not provide a meaningful comparison.

If you need to compare binary files, you can use the cmp command, which is specifically designed for this purpose. The cmp command compares two files byte by byte and reports the first difference it finds.

Example of Using cmp

To compare two binary files, you would use:

cmp file1.bin file2.bin

If the files are identical, cmp will produce no output. If they differ, it will indicate the location of the first difference.

Alternative: diff with -a Option

If you want to use diff and treat binary files as text (which may not always yield useful results), you can use the -a option:

diff -a file1.bin file2.bin

However, this is generally not recommended for true binary comparisons, as it may produce garbled output.

For accurate binary file comparisons, stick with cmp or other specialized tools like vbindiff or xxd for a hex dump comparison.