From: "framefritti@..." <framefritti@...>
Date: 2008-04-24T20:40:09+09:00
Subject: Re: Executing systems commands



John Maclean ha scritto:

> =begin
> Hey chaps.
>
> I'm using an array to find the locations of various commands on a
> system. Three versions of the same thing. Two work and one doesn't. Any one
> know why?
> =end
>
> # here's an array of commands that we want to find
> k = %w[ ruby xterm enlightenment emacs]
>
>
> #why does this work?
> k.each do |x|
>   p system("which #{x}")
> end
>
> # and this work
> k.each do |x|
>   p system("whereis #{x}")
> end
>
>
> # but this doesn't
> k.each do |x|
>   p system("type -p #{x}")
> end
>
>
> __END__
> Regards,
>

Just a hint (maybe wrong): could this depend on the fact that "type"
is a
shell builtin, while "which" and "whereis" are external commands?