`echo` is a shell builtin on my machine. In that case, we certainly have access to an interpreter (the shell), which means we should have access to other interpreters. Why not define `true` as

   #!/bin/sh
   exit 0

? Similarly, why not use `sh` or one of those other interpreters to write the rest of the utilities? `cc` probably isn't that important after all. `chmod` and `sh` are!