How to compare binary files to check if they are the same?

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What is the easiest way (using a graphical tool or command line on Ubuntu Linux) to know if two binary files are the same or not (except for the time stamps)? I do not need to actually extract the difference. I just need to know whether they are the same or not.

The standard unix diff will show if the files are the same or not:

[me@host ~]$ diff 1.bin 2.bin
Binary files 1.bin and 2.bin differ

If there is no output from the command, it means that the files have no differences.

How do I compare binary files in Linux?, Generate a test case with a single removal of byte 64: When using hexdumps and text diff to compare binary files, especially xxd , the additions a hexdump / diff of a file or files -G, --green Only show lines containing bytes that are the same​  File Compare or FC as we will refer to is from here on out, is a simple program that will compare the contents of text or binary files and is capable of comparing both ASCII and Unicode text. You can use this tool to display any lines from two files or two sets of files that do not match up with the others.

Use cmp command. This will either exit cleanly if they are binary equal, or it will print out where the first difference occurs and exit.

Compare binary files quickly and efficiently with this diff tool , This tutorial describes how to compare binary files, and discusses various binary file comparison options. Video tutorial View video demonstration. Steps: ExamDiff Pro dialog showing that you are comparing two different binary files Useful answer. The output file size is about 3 times as big as the input file. This command will convert a binary file to hex. objcopy -I binary -O ihex <in_file> <out_file> – evpo Sep 23 '15 at 0:27

Binary (Comparing and Merging Files), If diff thinks that either of the two files it is comparing is binary (a non-text file), diff determines whether a file is text or binary by checking the first few bytes in the file; not useful. diff3 uses the same test as diff to decide whether a file is binary. So the files have to be very similar (eg, just some bytes in the Unix timestamp when the object files were compiled - which is built into some object files) but the rest needs to be the same. Add 3 bytes to a constant string and everything after that is different.

Use sha1 to generate checksum:

sha1 [FILENAME1]
sha1 [FILENAME2]

How to Use FC (File Compare) from the Windows Command Prompt, There is a great command line tool that can be used to compare files to see if there that will compare the contents of text or binary files and is capable of lines from two files or two sets of files that do not match up with the others. here will tell FC that when it finds mismatched lines, it can only continue if  There is a relatively simple way to check if two binary files are the same. If you use file input/output in a programming language; you can store each bit of both the binary files into their own arrays. At this point the check is as simple as : if(file1 != file2){ //do this }else{ /do that }

I ended up using hexdump to convert the binary files to there hex representation and then opened them in meld / kompare / any other diff tool. Unlike you I was after the differences in the files.

hexdump tmp/Circle_24.png > tmp/hex1.txt
hexdump /tmp/Circle_24.png > tmp/hex2.txt

meld tmp/hex1.txt tmp/hex2.txt

VBinDiff - Visual Binary Diff, VBinDiff (Visual Binary Diff) displays files in hexadecimal and ASCII (or EBCDIC). It When I couldn't find a similar utility for the PC, I wrote it myself. Space now moves to the next difference (same as Enter): win32/vbindiff.rc had been left out  In the Actions menu, the Compare Contents command performs content comparisons on the selected pairs of files to determine if they match. Content comparison methods. CRC comparison compares files using their CRC values. Binary comparison compares files byte-by-byte. Rules-based comparison compares files based on their file format associations

Comparing Binary Files, Merge can interpret and display the bytes that make up the files in various ways to give, for example, a hexadecimal, decimal or floating-point view of the file data. Or, if you are already viewing a binary comparison, click the New binary  SlickEdit DIFFzilla utility was used to compare old.a and new.a binary files. The files are not getting compared because first part of old.a is shown against Imaginary Buffer. Then, first part of new.a is show against Imaginary Buffer.

Nine ways to compare files on Unix, Sometimes you want to know if some files are different. to a file, and then use that file to force the second file to be the same as You can also use the diff command to compare binary files, but it will only tell you if the files  The simplest way to check 2 files for equal contents is to use File.ReadAllBytes on each file and then compare the result arrays. If the arrays have the same length, each byte must be compared for accurate results. However: If the arrays have different lengths, we know the files are not equal.

Files are the Same, but Beyond Compare Says They are Different, If two text files look the same but show differences, it's likely there are When line endings are different, a binary comparison will show a mismatch even though session or the Text Compare's View | Hex Details to identify byte differences.

Comments
  • A question asking to show how they differ: superuser.com/questions/125376/…
  • The man page for cmp specifically says it does a byte by byte comparison so that is my default for 2 binary files. diff is line by line and will give you the same Yes/No answer but of course not the same dump to the standard out stream. If the lines are long because perhaps they are not text files then I would prefer cmp. diff has the advantage that you can specify a comparison of directories and the -r for recursion thereby comparing multiple files in one command.
  • diff seems to have problems with really large files. I got a diff: memory exhausted when comparing two 13G files.
  • Interesting output. diff is telling you they are "binary" fies. Since all files can be considered to be binary that's a strange assertion.
  • You can report identical files with option: diff -s 1.bin 2.bin or diff --report-identical-files 1.bin 2.bin This shows Files 1.bin and 2.bin are identical
  • No, it will say that they are "differ", so they are not the same
  • I have two executables, I know they are different because I compiled and ran them, but all options of diff and cmp given here judge them identical. Why? !!!
  • For the use case the OP describes IMHO cmp is more efficient than diff. So I'd prefer this.
  • I have a shell script that runs: cmp $1 $2 && echo "identical" || echo "different"
  • does the cmp stop when it found the first difference, and display it or it goes through the end of the files?
  • cmp has "silent" mode: -s, --quiet, --silent - suppress all normal output. I didn't test yet but I think that it will stop at the first difference if there is one.
  • Nice... I /thought/ I only wanted to know whether the files differed; but being able to see the exact differences easily was a lot more useful. It tended to segfault when I got to the end of the file, but never mind, it still worked.
  • It's been said a few times, but this is a great little program! (fyi also on homebrew)