Weitse, the author of 2 of those tools, is the only systems person at his university who I'm aware of who has done a lot of tooling. Allman, author of sendmail,

Weitse, the author of 2 of those tools, is the only systems person at his university who I'm aware of who has done a lot of tooling. Allman, author of sendmail, was not a sysadmin by any stretch of the imagination. IIRC he was a grad student then systems hacker who was surrounded by unix and programming. Sure, lots of systems people program and love programming, but the job isn't to write write tcp_wrappers, postfix, sendmail etc. it's to do what's needed to make sure that such things run, which is a different kind of programming.