From: Jeremy Wells <jwells@...>
Date: 2006-11-24T11:39:07+09:00
Subject: Re: double-slashes in input causing trouble

Jan Svitok wrote:
> or you can use references:
>
> old_section = $1
> new_body = body.sub(old_section, bit_at_top + '\&')
>
> \& = the last match.
>
> if there was gsub instead of sub, this would be slower as the
> replacement takes place on every occurence. In this case, however,
> there's max 1 occurence.
>
> You can do as well:
> - body = ""
> - File.open(input, 'r') do |file|
> -   body = file.read
> - end
> + body = File.read(input)
>
> and
>
>    File.open(input,'w') do |file|
>      file.write new_body
> -   end
> +   end unless new_body == body
>
thanks, thats useful to know for the future. this was something of a run 
once and its done program, and i've um run it now, so its done.