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difference between hexdump and objdump.

I am not clear with difference between hexdump and objdump and coredump.
I wrote a small program

Code:

main (){

int a=2;

int b=4;

int k=b/a;

int m=9;

}

and tried to compare its hexdump and objdump.
Here is a link to the hexdump
and objdump.

I tried to search the instructions found in objdump with the numbers in hexdump I was expecting a line in objdump such as

Code:

 8048398:    83 e4 f0                and    $0xfffffff0,%esp

 804839b:    ff 71 fc                pushl  -0x4(%ecx)

 804839e:    55                      push  %ebp

 804839f:    89 e5                    mov    %esp,%ebp

 80483a1:    51                      push  %ecx

 80483a2:    83 ec 1c                sub    $0x1c,%esp

 80483a5:    c7 45 f8 02 00 00 00    movl  $0x2,-0x8(%ebp)

 80483ac:    c7 45 f4 04 00 00 00    movl  $0x4,-0xc(%ebp)

 80483b3:    8b 45 f4                mov    -0xc(%ebp),%eax

 80483b6:    89 45 e0                mov    %eax,-0x20(%ebp)

 80483b9:    8b 55 e0                mov    -0x20(%ebp),%edx

 80483bc:    89 d0                    mov    %edx,%eax

 80483be:    c1 fa 1f                sar    $0x1f,%edx

 80483c1:    f7 7d f8                idivl  -0x8(%ebp)

 80483c4:    89 45 f0                mov    %eax,-0x10(%ebp)

 80483c7:    c7 45 ec 09 00 00 00    movl  $0x9,-0x14(%ebp)

Some of the above instructions such as 89 d0 should be present in hexdump.
What exactly is the hexdump ,objdump and coredump and what is their importance?
Why do scripting languages not have these or if I am wrong then correct me.

Hi -

Quote:

Q: Why do scripting languages not have these?

A: There are basically two kinds of "programs":

1) "Compiled programs" (like C, C++ and FORTRAN) parse source
code and turn it into machine instructions (binary, executable programs).

2) "Interpreted programs" (aka "scripting languages", like bash and Perl) interpret and execute the source code on-the-fly. The program (e.g. "/usr/bin/perl") parses and executes the script directly - there's never a "binary .exe of the program" in the middle.

Quote:

Q: I tried to search the instructions found in objdump with the numbers in hexdump I was expecting a line in objdump...

A: A binary executable (e.g. "myprog.exe") is more than just "a bunch of assembly instructions". It has a structure: a header, executable code sections, pre-initialized data sections, dynamic references (to be "filled in" from shared libraries), etc etc.

Examples of binary object file formats include ELF, COFF, PE and OMF.

The purpose of "objdump" is to show the elements in (the "structure of") a binary object file.

The purpose of "hexdump" is to show the contents of a binary file.

'Hope that helps .. PSM