From: Peter Zotov <whitequark@...>
Date: 2012-09-07T19:45:44+09:00
Subject: Re: cant change the string

Ferdous ara писал 07.09.2012 14:32:
> but I want
>
>         if host_name =~ /^BD/
>    host_name.gsub("BD","DK")
>         puts host_name
> end
>
> so if hostname is BD, it will change it to DK   (this number can be
> change anytime)
> So End result will be
>
> DK55
>
> but its not working

Generally, Ruby methods tend to return a new object rather than 
mutating
an existing one. Mutating methods often have a bang postfix, i.e. 
"gsub!".
This is not enforced by Ruby language itself, but is a useful 
convention.

So, you need to use `host_name.gsub!("BD", "DK")'.

-- 
   WBR, Peter Zotov.