File: tail.rb

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ruby-file-tail 1.4.0-1
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#!/usr/bin/env ruby

require 'file/tail'

filename = ARGV.pop or fail "Usage: #$0 number filename"
number = (ARGV.pop || 0).to_i.abs

File::Tail::Logfile.open(filename) do |log|
  log.backward(number).tail { |line| puts line }
end