gistfile1.rb

ids = File.readlines("id_to_change_all_uniq").map(&:chomp)
replacements = {}
ids.each {|id| replacements[id] = (Integer(id)+ 1000).to_s}
file2 = File.open("dump-to-database-yshop", 'wb')
 
File.open("yshop_14-megaslice").each do |line|
 possible_ids = line.scan /\d+/
 possible_ids.each {|id|
   if (replace = replacements[id])
    line.sub! /\b#{id}\b/, replace
   end
 }
 file2.write(line)

end

file2.close