Things to build from scratch

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• HTTP server

• Shell (in C)

  Prompt loop, input parsing, fork()/execvp(), cd builtin, pipes. Done when it can navigate the machine and run normal programs

• Compiler

  Maybe an interpreter or a build system too

• Kernel

• Distributed system

  Design, build and deploy one

• Emulator

• Self-replicating virus

• Ray tracer

  Spheres, a light source, shadows; output a .ppm file