Ping multple servers and sort

ping.sh

#!/bin/bash

o=output
cap=10

for server in $(cat servers)
do
    ping=$(ping "$server" -c $cap)
    avg=$(echo $ping| grep avg | cut -d'/' -f 5)
    if [[ "$avg" != "" ]]; then
        echo "$avg $server"
        echo "$avg $server" >> $o
    fi
done

sort $o