shell 时间

用时：

#!/bin/bash

info=`date`

start=$(date "+%s")

sleep 2

now=$(date "+%s")

time=$((now-start))

echo "$info time used:$time seconds"

输入时间参数判定

#!/bin/sh

source ~/.bashrc

the_day=`date +%Y%m%d -d"yesterday"`

if [ $# -eq 1 ]; then

    the_day=$1

fi

echo $the_day

year=`date +%Y -d"$the_day"`

month=`date +%m -d"$the_day"`

day=`date +%d -d"$the_day"`

echo $year

echo $month

echo $day