Re: [Probably] silly question

From: David Thompson (foobar@foobar.com)
Date: 04/16/03 

From: "David Thompson" <foobar@foobar.com>
Date: Wed, 16 Apr 2003 16:37:31 GMT

"Tricky Dicky" <trickydicky99@hotmail.com> wrote
> On Wed, 16 Apr 2003 11:35:37 +0200, "Laurent Le Boterve"
> >"Tricky Dicky" <trickydicky99@hotmail.com>
> >> I'm using the bourne shell for College. If I have the following 3
> >> variables:
> >>
> >> $one="vari" $two="able" $variable="Working"
> >>
> >> How would I get the shell to echo "Working" by using the values of the
> >> two other variables? Is it possible?
> >
> >$ one="vari" ;two="able" ;variable="Working"
> >$ eval echo '$'$one$two
> >Working
>
> Thank you so much. I had been scratching my head for a while trying to
> do that one :)

Think in terms of the steps needed. First build the name of
the variable, and echo that,

  echo "$one$two"

but you know you need a $ in front, and you know you have to
escape the $ to protect it from echo, so now do that,

  echo "\$$one$two"

now you're golden, put the eval in front and now echo will
print the value of $variable, rather than string "$variable",

  eval echo "\$$one$two"

Easy, huh? 

--
David Thompson