shell计算时间差

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#!/bin/bash current1=`date "+%Y-%m-%d %H:%M:%S"`   start_time=`date -d "$current1" +%s`   sleep 5s   current2=`date "+%Y-%m-%d %H:%M:%S"` end_time=`date -d "$current2" +%s`   #相减算差值   time_query=`expr $end_time - $start_time`   echo $time_query