Linux executable – hello world

To begin with, let's create a hello world program. Before anything else, we need to make sure that the tools required to build it are installed. Open a Terminal (the Terminal is Linux's version of Windows' Command Prompt) and enter the following command. This may require you to enter your super user password:

sudo apt install gcc

The C program compiler, gcc, is usually pre-installed in Linux.

Open any text editor and type the lines of following code, saving it as hello.c:

#include <stdio.h>
void main(void)
{
    printf ("hello world!\n");
}

You can use vim as your text editor by running vi from the Terminal.   

To compile and run the program, use the following commands:

The hello file is our Linux executable that displays a message in the console.

Now, on to reversing this program.

dlroW olleH

As an example of good practice, the process of reversing a program first needs to start with proper identification. Let's start with file:

It is a 32-bit ELF file-type. ELF...