如何在數據獲得最大的日期時間價值，並得到相應的數據

Question

輸入的樣子：

9999993612,10/Feb/2016:19:04:16 
9999993612,10/Feb/2016:19:04:15 
9999993612,10/Feb/2016:19:04:09 
9999993612,10/Feb/2016:01:31:47 
9999993612,10/Feb/2016:01:31:46 
9999993612,10/Feb/2016:01:31:43 

我們需要輸出。

9999993612,10/Feb/2016:19:04:16 

using linux command。

Answer 1

****它的正常工作**********

的awk「BEGIN {FS = 「」;打印「無時間」} NR！= 1 {a [$ 1] ++; b [$ 1] = $ 2} END {for（i in a）printf（「％s％s \ n」，i，b [i] ）}'FILENAME