"Stop using unportable sed/awk/readline/sh/ksh/csh black magic."
Anybody considering those tools to be 'black magic' is very likely to be a non-unix person. There are several quotes for the benefit of people like that:
"Contrary to popular belief, Unix is user friendly. It just happens to be very selective about who it decides to make friends with. -- unknown"
"Those who do not understand UNIX are condemned to reinvent it, poorly. -- Henry Spencer, programmer"
