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NM(1) General Commands Manual NM(1)

nm
display name list (symbol table)

nm [-aCegnoprsuw] [file ...]

The symbol table (name list) of each object in file(s) is displayed. If a library (archive) is given, nm displays a list for each object archive member. If file is not present, nm searches for the file a.out and displays its symbol table if it exists.

The options are as follows:

Display symbol table entries inserted for use by debuggers.
Decode low-level symbol names. This involves removing extra underscores and making C++ function names readable.
Output extended information, that is `w' for weak symbols, `f' for function-like symbols, and `o' for object-like symbols.
Restrict display to external (global) symbols.
Present results in numerical order.
Display full path or library name of object on every line.
Do not sort at all.
Reverse order sort.
Show archive index.
Display undefined symbols only.
Warn about non-object archive members. Normally, nm will silently ignore all archive members which are not object files.

Each symbol name is preceded by its value (a blank field if the symbol is undefined) and one of the following letters:

-
debugger symbol table entries (see the -a option)
absolute
bss or tbss segment symbol
common symbol
data or tdata segment symbol
indirect reference (alias to other symbol)
file name
read-only data segment symbol
text segment symbol
undefined
weak symbol (only on ELF binaries)

If the symbol is local (non-external), the type letter is in lower case. The output is sorted alphabetically.

ar(1), size(1), a.out(5), ar(5), elf(5), stab(5)

The nm utility appears as an optional part of IEEE Std 1003.1-2008 (“POSIX.1”); this incarnation of nm appears largely incompatible with that standard.

An nm command appeared in Version 6 AT&T UNIX.
September 28, 2011 OpenBSD-5.1