modify helloworld

beet:/tmp$ cat helloworld.c
#include <stdio.h>
int main()
{
   char * hw = "Hello, World!\n";
   printf("%s",hw);
   return 0;
}

beet:/tmp$ gcc helloworld.c -o helloworld_variable
beet:/tmp$ ./helloworld_variable
Hello, World!

beet:/tmp$ cp helloworld_variable modified_helloworld_variable

beet:/tmp$ ./modified_helloworld_variable
Hello, World!

beet:/tmp$ r2 -w modified_helloworld_variable
 -- Remember to maintain your ~/.radare_history
[0x00400430]> iz
vaddr=0x004005e4 paddr=0x000005e4 ordinal=000 sz=15 len=14 section=.rodata type=ascii string=Hello, World!\n

[0x00400430]> s 0x4005e4

[0x004005e4]> w Good, Bye!!!!

[0x004005e4]> q
beet:/tmp$
beet:/tmp$ ./modified_helloworld_variable
Good, Bye!!!!