From: Trans <transfire@...>
Date: 2006-08-15T02:15:08+09:00
Subject: Re: sh command that ascends dir tree for executable


Jeffrey Schwab wrote:
> Trans wrote:
> > Hmmm... What does:
> >
> >   File.expand_path('/')
>
> Eureka.
>
> irb(main):001:0> File.expand_path('/')
> => "C:/"
> irb(main):002:0> File.expand_path('C:/..')
> => "C:/"

Let ty this:

  def FileTest.root?(dir)
    pth = File.expand_path(dir)
    return true if pth == '/'
    return true if pth =~ /^(\w:)?\/$/
    false
  end

The == line should give a slight speed boost to unix systems.

T.