如何在linux中ping到主机才知道？

until ping -c1 www.google.com &>/dev/null; do :; done

请注意,ping本身用作循环测试;一旦成功,循环结束.循环体是空的,使用null命令“：”来防止语法错误.

更新：我想到了一种让Control-C干净地退出ping循环的方法.这将在后台运行循环,捕获中断(Control-C)信号,并在发生时终止后台循环：

ping_cancelled=false    # Keep track of whether the loop was cancelled,or succeeded
until ping -c1 "$1" &>/dev/null; do :; done &    # The "&" backgrounds it
trap "kill $!; ping_cancelled=true" SIGINT
wait $!          # Wait for the loop to exit,one way or another
trap - SIGINT    # Remove the trap,now we're done with it
echo "Done pinging,cancelled=$ping_cancelled"

它有点迂回,但是如果你想让循环可以取消它应该可以解决问题.