Hexeditr [verified] -

hexeditr -r sensitive.bin Hexeditr memory-maps files, so it can handle gigabytes. The classic hexedit loads the whole file into memory – avoid very large files. Comparing two files Open two terminal windows side-by-side, or use hexeditr file1 and hexeditr file2 separately. For diff, use hexdiff or vbindiff . Scripting / automation Hex editors are interactive. For scripted changes, use dd , printf , or Python’s open('file', 'r+b') . Example: