Like all other Linux related development, the work to write this manual was done on a volunteer basis: I did it because I thought it might be fun and because I felt it should be done. However, like all volunteer work, there is a limit to how much time, knowledge and experience people have. This means that the manual is not necessarily as good as it would be if a wizard had been paid handsomely to write it and had spent millennia to perfect it. Be warned.

excerpt from “The Linux System Administrators Guide - Intro”