nm—List symbols from object files

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

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

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

Options Description
–A, –o –print–file–name Precede each symbol by the name of the input file where it was found, rather than identifying the input file once only before all of its symbols.
–a, –debug–syms Display 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.
–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 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 uppercase or lowercase.
–g, –extern–only Display only external symbols.
–n, –v, –numeric–sort Sort symbols numerically by their addresses, not alphabetically by their names.
–p, –no–sort Don’t bother to sort the symbols in any order; just 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 what names.
–r, –reverse–sort Reverse the sense 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 objdump(1) for information on listing available formats.
–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.

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