tweak

Ncurses-based hex editor for viewing and editing binary files

brewmacoslinux

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Command-line, ncurses library based hex editor

tweak

Open a binary file for hex editing$ tweak /path/to/binary/file

Edit a specific offset in a file$ tweak -o 0x100 /path/to/file

Open a file in read-only mode$ tweak -r /path/to/file