Speaking of Regrets
daringfireball.net/linked/2009/10/13/thompson-unix
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Unix co-creator Ken Thompson, asked what he’d do differently if had it do all over again, replied that he’d include the trailing “e” in the creat() system call.