structs == <3

typedef void (*command_fun_ptr) (int, char**);

typedef struct command_t {
    char command[MAX_COMMAND_LENGTH];
    command_fun_ptr function;
    char description[256];
} command_t;

#define command_list_size 4
command_t command_list[command_list_size];
void __attribute__((constructor)) debug_shell_init(void)
{
    command_list[0] = (command_t) {"clear", (void*) command_clear, "Clear the screen"};
    command_list[1] = (command_t) {"exit", (void*) command_exit,   "Exit the shell"};
    command_list[2] = (command_t) {"halt", (void*) command_exit,   "Halt the machine"};
    command_list[3] = (command_t) {"echo", command_echo,           "Print out some text"};
}

.........