持续获取password

function GetPasswd 
{
RunCounter=1
DB_PSSWD=getpassword 
while [ -z "${DB_PSSWD}" -a ${RunCounter} -le 20 ] ; do
DB_PSSWD=getpassword

sleep 3 ## To address error "Cannot open /proc/net/tcp" and retry after 3 seconds
let RunCounter=${RunCounter}+1
done

if [ ! -z "${DB_PSSWD}" ]
then
export DB_PSSWD=${DB_PSSWD}
else
echo "Get DB password error"
exit 1
fi
}