The GNU Binary Utilities, or binutils, are a set of programming tools for creating and managing binary programs, object files, libraries, profile data, and assembly source code originally written by programmers at Cygnus Solutions.
The GNU binutils are typically used in conjunction with compilers such as the GNU Compiler Collection (gcc), build tools like make, and the GNU Debugger (gdb).
Through the use of the Binary File Descriptor library (libbfd), most tools support the various object file formats supported by libbfd.
H.J. Lu maintains a version of binutils with bleeding-edge features purely for Linux.
Ulrich Drepper wrote elfutils, to replace GNU Binutils, purely for Linux and with support only for ELF and DWARF 
The binutils include the following commands: