NM(1)NM(1)NAMEnm - display name list (symbol table)
SYNOPSISnm [ -agnoprumxjlfPA [ s segname sectname ]] [ - ] [ -t format ] [[
-arch arch_flag ]...] [ file ... ]
DESCRIPTION
Nm displays the name list (symbol table) of each object file in the
argument list. If an argument is an archive, a listing for each object
file in the archive will be produced. File can be of the form
libx.a(x.o), in which case only symbols from that member of the object
file are listed. (The parentheses have to be quoted to get by the
shell.) If no file is given, the symbols in a.out are listed.
Each symbol name is preceded by its value (blanks if undefined).
Unless the -m option is specified, this value is followed by one of the
following characters, representing the symbol type: U (undefined), A
(absolute), T (text section symbol), D (data section symbol), B (bss
section symbol), C (common symbol), - (for debugger symbol table
entries; see -a below), S (symbol in a section other than those above),
or I (indirect symbol). If the symbol is local (non-external), the
symbol's type is instead represented by the corresponding lowercase
letter. A lower case u in a dynamic shared library indicates a unde‐
fined reference to a private external in another module in the same
library.
If the symbol is a Objective C method, the symbol name is
±[Class_name(category_name) method:name:], where `+' is for class meth‐
ods, `-' is for instance methods, and (category_name) is present only
when the method is in a category.
The output is sorted alphabetically by default.
Options are:
-a Display all symbol table entries, including those inserted for
use by debuggers.
-g Display only global (external) symbols.
-n Sort numerically rather than alphabetically.
-o Prepend file or archive element name to each output line, rather
than only once.
-p Don't sort; display in symbol-table order.
-r Sort in reverse order.
-u Display only undefined symbols.
-U Don't display undefined symbols.
-m Display the N_SECT type symbols (Mach-O symbols) as (seg‐
ment_name, section_name) followed by either external or non-
external and then the symbol name. Undefined, common, absolute
and indirect symbols get displayed as (undefined), (common),
(absolute), and (indirect), respectively.
-x Display the symbol table entry's fields in hexadecimal, along
with the name as a string.
-j Just display the symbol names (no value or type).
-s segname sectname
List only those symbols in the section (segname,sectname).
-l List a pseudo symbol .section_start if no symbol has as its
value the starting address of the section. (This is used with
the -s option above.)
-arch arch_type
Specifies the architecture, arch_type, of the file for nm(1) to
operate on when the file is a universal file (see arch(3) for
the currently known arch_types). The arch_type can be "all" to
operate on all architectures in the file. The default is to
display the symbols from only the host architecture, if the file
contains it; otherwise, symbols for all architectures in the
file are displayed.
-f Display the symbol table of a dynamic library flat (as one file
not separate modules).
-A Write the pathname or library name of an object on each line.
-P Write information in a portable output format.
-t format
For the -P output, write the numeric value in the specified for‐
mat. The format shall be dependent on the single character used
as the format option-argument:
d The value shall be written in decimal (default).
o The value shall be written in octal.
x The value shall be written in hexadecimal.
SEE ALSOar(1), ar(5), Mach-O(5), stab(5), nlist(3)BUGS
Displaying Mach-O symbols with -m is too verbose. Without the -m, sym‐
bols in the Objective C sections get displayed as an `s'.
Apple, Inc. March 26, 2010 NM(1)
