How can I extract assembly code from a binary executable in Linux using objdump?

Disassembling a Binary Executable in Linux for Assembly Code

When confronted with the task of extracting assembly code from a binary executable, a disassembler serves as a valuable tool. While gcc may not natively incorporate this functionality, objdump emerges as a suitable candidate within the GNU development ecosystem.

To effectively leverage objdump for disassembly, employ the following command syntax:

$ objdump -d /path/to/binary

Execute this command, and the subsequent output will provide a detailed representation of the assembly code.

An example disassembly resembles the following:

080483b4 <main>:
 80483b4:   8d 4c 24 04             lea    0x4(%esp),%ecx
 80483b8:   83 e4 f0                and    xfffffff0,%esp
 80483bb:   ff 71 fc                pushl  -0x4(%ecx)
 80483be:   55                      push   %ebp
 80483bf:   89 e5                   mov    %esp,%ebp
 80483c1:   51                      push   %ecx
 80483c2:   b8 00 00 00 00          mov    x0,%eax
 80483c7:   59                      pop    %ecx
 80483c8:   5d                      pop    %ebp
 80483c9:   8d 61 fc                lea    -0x4(%ecx),%esp
 80483cc:   c3                      ret    
 80483cd:   90                      nop
 80483ce:   90                      nop
 80483cf:   90                      nop

By wielding this approach, developers can successfully extract assembly code from binary executables, gaining access to the underlying machine instructions.

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