old = File.open(ARGV[0]).collect
new = File.open(ARGV[1],"a+")
for i in 0..old.length-1
new.write(old.uniq[i])
end

##或简单两行也可以如qc.rb

old = File.open(ARGV[0]).collect
puts old.uniq

然后qc.rb dic.dic >new.dic