Exercises

❯ cat documents/

• -rw-r--r-- Build a DNS resolver — subject Subject 2026-08-09

  The work statement for a from-scratch DNS resolver — header and QNAME wire layout, the name-compression pointer rules, the root-to-authoritative delegation walk, cache semantics, and the annotated-capture proof.

• -rw-r--r-- Build a DNS resolver Exercise 2026-08-09

  Build a recursive DNS resolver from raw UDP datagrams — hand-packed packets, name compression, a walk from the root servers to an authoritative answer — then prove it on the wire with annotated captures.

• -rw-r--r-- Build your own shell Exercise 2026-08-08

  Implement a Unix shell from fork/exec up — pipes, redirection, job control, and signals — the process model's syscalls learned by wielding them.

• -rw-r--r-- Build your own shell — subject Subject 2026-08-08

  The feature spec for an interactive Unix shell — REPL, exec with PATH search, builtins, quoting, N-stage pipelines, redirections, background jobs, and signal handling — precise enough to implement and test.

• -rw-r--r-- Write Yourself a Git Exercise 2026-08-08

  Reimplement Git's core from the object store up — blobs, trees, commits, and refs — until the content-addressed model is muscle memory.

• -rw-r--r-- Write Yourself a Git — subject Subject 2026-08-08

  The build spec for a Git-compatible tool — the zlib+SHA-1 object store on-disk layout, plumbing and porcelain commands to implement, and the two-way interop requirement with stock git.