One fine day in 1991, grad student Keith Bostic came to the BSD lead developers, inspired by Richard M. Stallmans (remember him?
[13] GNU Project, and suggested replacing BSD’s remaining AT&T work to create a truly free BSD. Dreading the confrontation likely to result with AT&T, they tried to stall by assigning Bostic the difficult part of this task, rewriting some key BSD utilities. This backfired when he promptly did exactly that. So, they grumbled but then completed the job[14], and tried to prevent AT&T from noticing what they had done.