From: Jacob Fugal <lukfugl@...>
Date: 2006-01-20T01:10:02+09:00
Subject: Re: Unable to write to file... (example from "pickaxe book", second edition, p128)

On 1/19/06, Diego Algorta Casamayou <ruby@dac.e4ward.com> wrote:
> Change
>  >>> File.open("testfile", "r") do |file|
> to
>  >>> File.open("testfile", "w") do |file|

Well you need more than that. For one thing the file.gets will fail if
file was opened in write mode. Also the puts is going to STDOUT, not
the file. You probably want something like this:

#!/usr/bin/ruby
File.open("testfile", "w") do |file|
  while line = gets
    file.puts line
  end
end

This will get input from STDIN and write it out to test file. Program
terminates on EOF marker (CTRL-D when run interactively).

Jacob Fugal