说明：查看/etc/shadow下，用户的密码如果MAXDAYS < 10 则通知用户应该赶快修改密码。
#!/bin/bash
[ ! $USER='root' ] && echo "Only root can execute this scripts." && exits 2
MYFILE='/etc/shadow'
TODAY=$[`date +"%s"`/24/60/60]
if [ -e $MYFILE ];then
while read LINE;do
UNAME=`echo $LINE |cut -d: -f1`
let MAXDAY=`echo $LINE |cut -d: -f5`
[ $[$MAXDAY-$TODAY] -lt 10 ] && echo "${UNAME}'s password need to change."
done < $FILE
fi
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