shell script脚本计算自己的生日还有几天

[hfno1]

#!/bin/bash
read -p "请输入你的生日（格式为：MMDD）：" birthday
today=`date +%m%d`
if [ "$birthday" == "$today" ];then
echo "祝你生日快乐～！"
elif [ "$birthday" -gt "$today" ];then
year=`date +%Y`
total_day_s=$((`date --date="$year$birthday" +%s`-`date +%s`))
total_day=$(($total_day_s/60/60/24+1))
echo "你的生日还有：$total_day天"
else
year=$((`date +%Y`+1))
total_day_s=$((`date --date="$year$birthday" +%s`-`date +%s`))
total_day=$(($total_day_s/60/60/24+1))
echo "你的生日还有：$total_day天"
fi

[askandstudy]

[wangyutian2011]

只能看懂一点点....

[ljc007]

[Quote=引用 2 楼 wangyutian2011 的回复:]

只能看懂一点点....
[/Quote]
先把日期转换成秒，计算，然后再转换回天数。