nm — List symbol names in object files. More information: <https://manned.org/nm>.

List global (extern) functions in a file (prefixed with T)

nm {{[-g|--extern-only]}} {{path/to/file.o}}

List only undefined symbols in a file

nm {{[-u|--undefined-only]}} {{path/to/file.o}}

List all symbols, even debugging symbols

nm {{[-a|--debug-syms]}} {{path/to/file.o}}

Demangle C++ symbols (make them readable)

nm {{[-C|--demangle]}} {{path/to/file.o}}