\x7fELF
echo main
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
00000000 <.data>: 0: 7f 45 jg 0x47 2: 4c dec %esp 3: 46 inc %esi 4: 0a 65 63 or 0x63(%ebp),%ah 7: 68 6f 20 6d 61 push $0x616d206f c: 69 .byte 0x69 d: 6e outsb %ds:(%esi),(%dx)