检测服务器是否运行

#!/bin/sh
pingcmd(){
PRE="server $1 Ping $2"
MAILADD="123@qq.com"

ping -w 1 -c 1 $2>/dev/null
ret=$?
if [ $ret -eq 0 ]

then
    echo "$PRE OKn" | mail -s "$PRE status" $MAILADD

else
    echo "$PRE ERRORn" | mail -s "$PRE status" $MAILADD
fi
return 0
}

mainserver="192.168.1.3"
slaveserver="192.168.1.2"
pingcmd $mainserver $slaveserver