Unix

Unix was created in 1969
Moore's Law: computers are more than 1 million times faster today
Design has not changed since the mid-1980s
Evolution has not kept pace with Moore's Law

Conclusions
Unix was well designed
Creators made choices that are not valid today

Retrospective Design Flaws
Regular users cannot do anything in the system
Cannot mount file systems
Cannot run most daemon
Security problems
Buffer overflows
SUID applications