1.计算开学到现在过了多少天[root@deemscripts]#catrili.sh#!/bin/bash./etc/profile#D=`echodate+%Y%m%d`#Y=`2019-01-01`#awk'BEGIN{print$D-20190101}'A=`echodate--date=20181122+%s`B=`echodate+%s`echo$(((`$B`-`$A`)/60/60/24))#echo`$D`