rtt() { local h="$1" c="${2:-1}"; if [ -z "$h" ]; then return 1; fi; printf "%s %s\n" "$h" "$(ping -W1 -c "$c" "$h" | awk '/rtt/{ gsub("/", " ", $4); print $4 }')"; };
sort-by-rtt() { mapfile hosts; while read -r h _; do rtt "$h" & done < <(printf "%s\n" "${hosts[@]}") | sort -nk2; wait; }
# sort-by-rtt < <( awk '{print $2}' ~/.hosts | shuf -n3)