save_history() public

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# File lib/irb/ext/save-history.rb, line 86
    def save_history
      if num = IRB.conf[:SAVE_HISTORY] and (num = num.to_i) > 0
        if history_file = IRB.conf[:HISTORY_FILE]
          history_file = File.expand_path(history_file)
        end
        history_file = IRB.rc_file("_history") unless history_file
        open(history_file, 'w' ) do |f|
          hist = HISTORY.to_a
          f.puts(hist[-num..-1] || hist)
        end
      end
    end
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