Shell Programming and Scripting

color   product id status
green   102        pass
yellow  201        hold
yellow  202        keep
green   101        ok
green   103        hold
yellow  203        wait

color	product id	status
green	102	pass
yellow	201	hold

array=[]
File.open("file").each_line do |line|
  first = line.split(/\s+/).first
  if not array.include?(first) 
    puts line
    array << first 
  end       
end

# ruby test.rb 
color product id status
green 102 pass
yellow 201 hold

awk 'NR==1||!A[$1]++' file

awk '!A[$1]++' file