gistfile1.txt

ids_t=[]
ids_t = File.readlines("id_to_change_all_uniq")
ids=ids_t.map(&:chomp)
new_id=""
file2 = open("dump-to-database-yshop", 'w')


File.open("yshop_14-megaslice").each do |line|
 if ( id = ids.find { |w| line =~ /\b#{w}\b/ } )
        new_id = id.to_i + 10000
        line.gsub!(/\b#{id}\b/,"#{new_id}")
        file2.write(line)
 else
        file2.write(line)
 end
end