linux shell编程 5 判断登陆用户，然后重启关闭系统

　其中的＄LOGNAME 就是获取登陆的用户名（注意这里的LOGNAME 是区分大小写的）

#!/bin/bash
#  if user is root rebold  else  change to root than  rebold
user=$LOGNAME
echo "$user"
if [ "$user" = "root" ]
then
echo " user is  root  rebort system"
init 6
else
echo "$user  end "
exit  1
fi