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利用awk快速求和
假如有下面这样一段文本内容： $ grep Lock_time: slow.log | head # Query_time: 1.097620 Lock_time: 0.000000 Rows_sent: 0 Rows_examined: 0 # Query_time: 0.000111 Lock_time: 0.000060 Rows_sent: 1 Rows_examined: 1 # Query_time: 0.000462 Lock_time: 0.000120 Row