A common trick to decrease code size in RAM, is to link everything to a single program, then have the program check its argv[0] to know which program to call.

A common trick to decrease code size in RAM, is to link everything to a single program, then have the program check its argv[0] to know which program to call. With the right filesystem (certain kinds of read-only), the code (text segment) can even be mapped directly, and no loading into RAM need occur at all. These approaches saves memory even on regular MMU platforms.