apt install lfhex, but that version is sadly plagued with a long-standing bug which hides the (very handy) "Cursor Offset" selection box:
| lfhex missing Cursor Offset | lfhex with Cursor Offset |
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As Kalle Olavi Niemitalo explains in the aforementioned bug report, removing statusBar()->showMessage("Ready",2000); from hexGui.cpp before compiling works, but only if you have older versions of Qt, gcc, g++, etc. to compile with (or manage to resolve compatibility problems like this one).
After several false starts, I got a x64 binary compiled under Ubuntu 12.04, gcc 4.6.3, and Qt 4.8.1. Works fine under newer Debian-based distros as well.
See also wxHexEditor, a cross-platform (Linux, Windows, OS X), open source hex editor with support for very large files (up to 2EB) and raw disk access (under POSIX systems). The current version, 0.23 beta, is available via apt install wxhexeditor.
UPDATE 1: Just noticed this on the lfhex homepage under "Limitations": "Search/compare can be slow (compared to cmp or any other non-paged IO app)". Note that cmp -s is faster than just cmp and roughly equal to diff -q. More info. Tip: If you just need to know whether two large files differ, first check the file sizes. Only then if necessary run: diff --speed-large-files --brief --report-identical-files file1 file2.
UPDATE 2: To compare two files, run lfhex -c file1 file2 (there isn't a comparison option within the GUI, though the preceding command will launch the GUI in comparison mode).
/nix | Nov 05, 2016