snip out large text file with regexp

snippet.rb

#!/usr/bin/env ruby

path, from, to = $*
unless path && from && to
  puts <<-__DESCRIPTION__
  ./echo_between.rb file_path "from" "to"
  
  snips large text file
   
  command starts to print lines when matched "from"
  and stops when matched "to"
  __DESCRIPTION__
  exit(1)
end

switched = false
File.open(path, 'r').each do |line|
  switched = true if line.match(/#{from}/)
  if switched && line.match(/#{to}/)
    puts "end with line: #{line}"
    exit(0)
  end
  puts line if switched
end