Operating systems, infrastructure, emulation, and technical history.
Microsoft's August 2016 announcement put PowerShell on GitHub and introduced it on Linux and macOS, changing its scope well beyond Windows administration.
tmux 3.0 shipped in late 2019 with changes from its normal development process — the major version bump was not a promise of semantic-versioning upheaval.
Interactive Bash editing is a library-driven state machine: keymaps, completion hooks, history, and terminal escapes all meet inside GNU Readline.
Reliable shell cleanup requires understanding signals, traps, process groups, and the important difference between a normal exit and an uncatchable termination.
PTYs and a persistent server process explain how tmux and screen survive a dropped SSH connection, not just several shells in one window.
Reconstruct the October 29, 1969 UCLA-to-SRI login from the IMP log, and separate ARPANET's first host message from later Internet myths.
Follow C from Bell Labs and K&R practice through ANSI X3J11, ISO C and C23, including what portability guarantees—and deliberately leaves open.
Trace the NIC host table's scaling failure, Mockapetris's delegated DNS design, the staged 1983–85 migration, caching tradeoffs and later DNSSEC.
How Ethernet moved from a 2.94-megabit coax experiment to switched full-duplex links without depending on collisions forever.
How GNU's freedom-centered movement and the 1998 open-source campaign came to share much software while making different arguments.