obnoxious about how much mail you have
program counts your mail and tells
you about it rather obnoxiously.
program first appeared in
first written by Noah Friedman
⟨firstname.lastname@example.org⟩ in 1993. This version was written by
Charles M. Hannum ⟨mycroft@NetBSD.org⟩.
The read loop is horrendously slow on every shell implementation tried.
instead, though these are not shell builtins.