echo `sed -n '1!G;h;$p' <<< "\`ping -c 5 localhost\`" | sed -n 's/^.* received, \([^ ]*\) packet loss.*$/\1 loss/p;s/^rtt min\/avg\/max\/mdev = [0-9.]*\/\([^/]*\)\/.*$/\1/p'`
thanks vali