nm

nm [ -a | --debug-syms ]  [ -g | --extern-only ]
   [ -B ]  [ -C | --demangle ] [ -D | --dynamic ]
   [ -s | --print-armap ]  [ -A | -o | --print-file-name ]
   [ -n | -v | --numeric-sort ]  [ -p | --no-sort ]
   [ -r | --reverse-sort ]  [ --size-sort ] [ -u | --undefined-only ]
   [ -t radix | --radix=radix ] [ -P | --portability ]
   [ --target=bfdname ] [ -f format | --format=format ]
   [ --no-demangle ] [ -V | --version ]  [ --help ]  
                           [ objfile... ]

GNU nm lists the symbols from object files objfile.... If no object files are listed as arguments, nm assumes `a.out'.

For each symbol, nm shows:

• The symbol value, in the radix selected by options (see below), or hexadecimal by default.
• The symbol type. At least the following types are used; others are, as well, depending on the object file format. If lowercase, the symbol is local; if uppercase, the symbol is global (external).

  A

  Absolute.

  B

  BSS (uninitialized data).

  C

  Common.

  D

  Initialized data.

  I

  Indirect reference.

  T

  Text (program code).

  U

  Undefined.

• The symbol name.

The long and short forms of options, shown here as alternatives, are equivalent.

-A

-o

--print-file-name

Precede each symbol by the name of the input file (or archive element) in which it was found, rather than identifying the input file once only, before all of its symbols.

-a

--debug-syms

Display all symbols, even debugger-only symbols; normally these are not listed.

-B

The same as `--format=bsd' (for compatibility with the MIPS nm).

-C

--demangle

Decode (demangle) low-level symbol names into user-level names. Besides removing any initial underscore prepended by the system, this makes C++ function names readable. See section c++filt, for more information on demangling.

--no-demangle

Do not demangle low-level symbol names. This is the default.

-D

--dynamic

Display the dynamic symbols rather than the normal symbols. This is only meaningful for dynamic objects, such as certain types of shared libraries.

-f format

--format=format

Use the output format format, which can be bsd, sysv, or posix. The default is bsd. Only the first character of format is significant; it can be either upper or lower case.

-g

--extern-only

Display only external symbols.

-n

-v

--numeric-sort

Sort symbols numerically by their addresses, rather than alphabetically by their names.

-p

--no-sort

Do not bother to sort the symbols in any order; print them in the order encountered.

-P

--portability

Use the POSIX.2 standard output format instead of the default format. Equivalent to `-f posix'.

-s

--print-armap

When listing symbols from archive members, include the index: a mapping (stored in the archive by ar or ranlib) of which modules contain definitions for which names.

-r

--reverse-sort

Reverse the order of the sort (whether numeric or alphabetic); let the last come first.

--size-sort

Sort symbols by size. The size is computed as the difference between the value of the symbol and the value of the symbol with the next higher value. The size of the symbol is printed, rather than the value.

-t radix

--radix=radix

Use radix as the radix for printing the symbol values. It must be `d' for decimal, `o' for octal, or `x' for hexadecimal.

--target=bfdname

Specify an object code format other than your system's default format. See section Target Selection, for more information.

-u

--undefined-only

Display only undefined symbols (those external to each object file).

-V

--version

Show the version number of nm and exit.

--help

Show a summary of the options to nm and exit.