shell if [ “x{val}” == “x” ]
ping=`ping -c 10 -W 1 www.baidu.com`
rtt=`echo "$ping"|grep rtt`
if [ "xrtt" == "x" ]
then
echo "rtt emtpy"
else
echo "rtt ok"
fi
ping=`ping -c 10 -W 1 www.baidu.com`
rtt=`echo "$ping"|grep rtt`
if [ "xrtt" == "x" ]
then
echo "rtt emtpy"
else
echo "rtt ok"
fi