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get unique lines from files

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#!/usr/bin/env ruby
 
my_files = Dir.chdir(ARGV[0]) { Dir.glob("./*").map{|x| File.expand_path(x) } }
 
def my_array_steamer(oldarr, newfile)
lines = (File.readlines(newfile)).map(&:strip)
oldarr | lines
end
 
my_arr = Array.new
my_files.each do |x|
my_arr = my_array_steamer(my_arr,x)
end
 
File.open('temp.txt', 'w') {|f| f.puts(my_arr) }
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