Linux 如何做 Binary 檔案的 Diff

Linux 遇到兩個 Binary 檔案，想要比較看看有什麼不一樣，要怎麼做呢？

Linux 如何做 Binary 檔案的 Diff

最基本想要知道有沒有不同，只要做 diff 即可。

• $ diff file1 file2 # 沒有結果就是相同，若不同會出現「二元碼檔 file1 與 file2 不同」

想要看更詳細的不同，我平常比較常用的是 xxd 和 hexdump

xxd

1. $ xxd file1 > file1.hex
2. $ xxd file2 > file2.hex
3. $ diff file1.hex file2.hex

hexdump

1. $ hexdump a > a.hex
2. $ hexdump b > a.hex
3. $ diff a.hex b.hex
4. $ vimdiff a.hex b.hex

下述摘錄自此篇：diff - How do I compare binary files in Linux?

• $ diff <(xxd ./new-file.bin) <(xxd ./original-file.img) > diff-part.hex
• $ vimdiff <(xxd ./new-file.bin) <(xxd ./original-file.img)
• $ cmp -l file1.bin file2.bin | gawk '{printf "%08X %02X %02X\n", $1, strtonum(0$2), strtonum(0$3)}'