为什么这段代码只运行一次？

Question

为什么下面的代码只运行一次？

while read -r p q; do
                echo "$p +  $q"
                ssh -q user@hostname "/tmp/telnet $p $q" >> /tmp/out
                grep -i refused /tmp/out
                if [ $? != 0 ]; then
                 echo "$i: telnet : connect to addreess $p on $q: Connection successful."
                fi
                rm /tmp/out
           done < list

列表具有以下内容

server1 80
server2 443