From: Brian Candler <B.Candler@...>
Date: 2007-02-10T22:37:32+09:00
Subject: Re: ENV['COLUMNS']

On Sat, Feb 10, 2007 at 08:25:09PM +0900, pedro mg wrote:
> in irb I can have access to ENV['COLUMNS'] for the # of columns in the 
> shell, and works fine.
> But inside a script (ruby script.rb), I can't have access to that hash 
> key and value.
> I've done a:
> 
> puts ENV.to_a
> 
> and i can not see both COLUMNS and LINES
> What would be the problem ?

Nothing to do with ruby...

brian@mappit:~$ echo $COLUMNS
80
brian@mappit:~$ printenv | grep COLUMNS
brian@mappit:~$

This is a shell-internal variable, and not exported by default to processes
launched from the shell. But it can be if you wish:

brian@mappit:~$ export COLUMNS
brian@mappit:~$ printenv | grep 80
COLUMNS=80
brian@mappit:~$

Brian.