until_who

一些shell程序

#!/bin/bash
#until_who
IS_ROOT=`who | grep root`
until [ "$IS_ROOT" ]
do
sleep 5
IS_ROOT=`who | grep root`
done
echo "watch root in">>/tmp/root.log
echo "date is: " `date` >>/tmp/root.log
echo "******************">>/tmp/root.log
echo  "watch root in"