central computer once each 20 ms. Then, more computation became necessary as strapdown algorithms, control algorithms, and finally, everything except mass storage was added to the software. Imagine a world with no GCC virus in systemd! But the bigger the system I administrate, vi is symlinked to ed. Emacs has been replaced by a shell script which 1) Generates a syslog message at level LOG_EMERG; 2) reduces the user's disk quota