From: dblack@...
Date: 2003-09-25T05:00:55+09:00
Subject: Re: Setting "variable" global variable ?

Hi --

On Thu, 25 Sep 2003, Hal Fulton wrote:

> dblack@superlink.net wrote:
>
> > I don't want to be responsible for encouraging non-vigilance toward
> > things like this...  but if val is a string, wouldn't eval'ing val
> > just result in the string, not a further evaluation of the string?
> >
> >   a = "puts 'hi'"
> >   eval "b = a"
> >
> > b is now "puts 'hi'", but 'hi' doesn't get puts'd.
> >
> > (Or is there another, more evil scenario I'm not thinking of?)
>
> I was thinking of something like
>
>    set_global_variable(name,666)
>
> where name is given a value like '1 + `someprog`; $foo' which would
> effectively result in:
>
>    eval("$1 + `someprog`; $foo = 666")

I realized this (that you meant name, not val) about halfway between
my office and class :-)


David

-- 
David Alan Black
home: dblack@superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav