tiny-elf

A very tiny ELF (Executable and Linkable Format) executable, that does exactly the same as

int main(void) {
  return 42;
}

but a 100 times thinner.

Source

http://www.muppetlabs.com/~breadbox/software/tiny/teensy.html

(cached version)

Run it

$ nasm -f bin -o a.out tiny.asm
$ chmod +x a.out
$ ./a.out ; echo $?
  42
$ wc -c a.out
  45 a.out

Credits

All credits to muppetlabs.com